I thought someone might have mentioned this by now, but ....

Some time back, one African antelope was demoted from common to rare and yet a much less-used antelope (referring to word frequency; I have no idea which species is more common) recently appeared as a seed word. According to the Ngram Viewer, eland has been consistently twice (or more) used than springbok.

Litya is familiar to Orthodox Christians.

I don't think is a spoiler, but have left the word off the subject just in case. I've forgot to make this suggestion many times — memory like a sieve. The suggestion is cuban. It is a type of sandwich which is very popular in south Florida (where I grew up).

It isn't recognised as a word, so this isn't a spoiler.

In a previous lifetime, I worked as an air traffic controller. One of the shifts was called a daymid. A typical work schedule was
Day 1: 1600-0000
Day 2: 1300-2100
Day 3: 1000-1800
Day 4: 0700-1500
Day 5: 0000-0800

The last two were referred to as a daymid. They were difficult. The only positive thing about them was having 80 hours off or 56 hours off (alternating each week) before returning to work.

Despite a very large number of studies which show shift workers need to be kept on a steady shift, despite the requirements for air traffic controllers to meet the same physical standards as pilots, despite requirements for pilots to have a minimum rest period of 10 hours, with the opportunity for at least 8 uninterrupted sleep hours, the Federal Aviation Administration allowed this as a normal schedule. And because every other week, the schedule was move up 24 hours, a controller would, in a 14 week period work all 24 hours all 7 days (forget about making a regular commitment (e.g. coaching youth sports, taking a college course, regularly making meetings of an organisation, etc.).

I hated the work schedule. And when I asked a supervisor why we worked such a 'stupid schedule', I got one of the all-time worst responses that can be given: 'that's the way we've always done it'!

Anyway, that was the flashback prompted by the letters in the puzzle.

By far the least played 'common' word. The next least played common word (batsmen) was played by more than 45% more players. Surely a candidate for demotion?

— an 'Anti-seed word' is a word which uses all the letters except the required letter —

For the current Challenge game the word is NEUROSIS

https://www.thefreedictionary.com/kegger — American slang, well known to anyone by the age of twenty.