An American theatre award presented to male opposite (7)
I believe the answer is:
antonym
'opposite' is the definition.
('antonym' can be a synonym of 'opposite')
'an american theatre award presented to male' is the wordplay.
'an american theatre award' becomes 'antony' (I've seen this in other clues).
'presented to' means one lot of letters go next to another.
'male' becomes 'm' (common abbreviation).
'antony'+'m'='ANTONYM'
(Other definitions for antonym that I've seen before include "A word's opposite" , "Nick's could be free" , "Opposite-meaning word" , "For villain, hero is one" , "A word opposite in meaning to another" .)