Am faring ok with this, but 2 small clues are bugging me.
12A Endure once a side event at cockfight (4) --y-
9D Bury some people's cage upside down (4) y---.
Thanks
Nor was I Chips! Since discovered that 'cage' is a dialect word for a squirrel's nest, or drey, according to Chambers Dictionary. Backwards, that gives the word 'yerd', meaning to bury.
OK, Chips! Rosie, I think first one is Zyrian, a people of North East Russia. appears to be a partial anagram of 'janizary'. The other one is tricky. May need another letter to crack it. Had a Guinness or three last night!