Fine swimmer in suit (7)
I believe the answer is:
forfeit
'fine swimmer in suit' is the definition.
'forfeit' can be an answer for 'fine' (I've seen this in another clue). I'm unsure of the 'swimmer in suit' bit.
'fine swimmer in suit' is the wordplay.
'fine swimmer' becomes 'orfe' (I've seen this before. I am not sure about the 'fine' bit.).
'in' is an insertion indicator.
'suit' becomes 'fit' (synonyms).
'orfe' inserted inside 'fit' is 'FORFEIT'.
Can you help me to learn more?
(Other definitions for forfeit that I've seen before include "Give up or lose the right to something" , "It has to be paid or given up as a penalty" , "Surrender as a penalty" , "Effort I made to pay penalty" , "Something given up as a penalty" .)