Straight men try love in circles after retiring (7)
I believe the answer is:
stooges
'straight men' is the definition.
(I've seen this in another clue)
'try love in circles after retiring' is the wordplay.
'try' becomes 'go' (both can mean an attempt).
'love' becomes 'o' (love means zero in tennis).
'in' means one lot of letters goes inside another.
'circles' becomes 'sets' ('set' can be a synonym of 'circle').
'after retiring' says the letters should be written backwards (retire can mean to go back).
'go'+'o'='goo'
'goo' inserted into 'sets' is 'segoots'.
'segoots' reversed gives 'STOOGES'.
(Another definition for stooges that I've seen is " Fall guys".)