Sportsmen who are paid for writing? Not quite (4)
I believe the answer is:
pros
'sportsmen who are paid' is the definition.
(I've seen this before)
'for writing? not quite' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'writing?' becomes 'ms' (abbreviation for manuscript).
'not quite' means to remove the first letter.
'ms' with its initial letter removed is 's'.
'pro'+'s'='PROS'
(Other definitions for pros that I've seen before include "Opposites of cons" , "Arguments in favour" , "Persons with knowledge and skill" , "Sportsmen who are paid" , "Positive arguments" .)