Local Cryptic - Few Tricky Ones

[pantonsteve]

aren't corners used in such a contest [8,5] initially thgought sporting arena ? or sth rings ?

production of dna units is to follow [7] cell sth / sth cell ?

it is used for making cuts in the theatre [8,5] surgical knife ?

some supple athenian to get creased [5] - thinking greece or grease but 6

doctor accepts one's hit the light [3,4] sth lamp ?

[aelmpvw]

sup(ple at)henian

[boxtops]

you're confusing us with your "sths" - can you tell us what letters you have already for these, please?

[aelmpvw]

football match?

[pantonsteve]

hi boxtops , thanks for your reply. unfortunately don't have any letters re dna clue - just guessed at cell sth or sth cell

also aelmpvw - thanks for football match

[boxtops]

ah - does sth mean "something" ? I've just twigged!