Clear identification entering competition (7)
I believe the answer is:
evident
'clear' is the definition.
(synonyms)
'identification entering competition' is the wordplay.
'identification' becomes 'ID'.
'entering' means one lot of letters goes inside another.
'competition' becomes 'event' (I've seen this before).
'id' going inside 'event' is 'EVIDENT'.
(Other definitions for evident that I've seen before include "clearly visible" , "Indisputable" , "Obvious, quite apparent" , "Obvious - 1 across" , "Clear to see" .)