Wrestler's a little too muscular to be flipped over (4)
I believe the answer is:
sumo
'wrestler's' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I can't see?
'a little too muscular to be flipped over' is the wordplay.
'a little' indicates the answer is hidden within the clue (a little bit of the clue).
'to be flipped over' says the letters should be written in reverse.
'omus' is hidden within 'too muscular'.
'omus' in reverse letter order is 'SUMO'.
Can you help me to learn more?
(Other definitions for sumo that I've seen before include "foreign form of fighting" , "one of the martial arts" , "Japanese wrestling with big fat men" , "Kind of wrestling" , "Jap. wrestling" .)