Woman conceals artist for sport (6)
I believe the answer is:
karate
'for sport' is the definition.
(I have seen 'Combative sport ' mean 'karate' so perhaps 'sport' could also mean 'karate')
'woman conceals artist' is the wordplay.
'woman' becomes 'kate' ().
'conceals' means one lot of letters goes inside another.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'kate' placed around 'ra' is 'KARATE'.
(Other definitions for karate that I've seen before include "A taker (anag)" , "Jap. combat; sort of chop" , "Combative sport" , "fighting system" , "Japanese form of unarmed combat" .)