After exercises, longs for fruit (7)
I believe the answer is:
peaches
'fruit' is the definition.
(I've seen this before)
'after exercises longs' is the wordplay.
'after' says to put letters next to each other.
'exercises' becomes 'pe'.
'longs' becomes 'aches' ('ache' can be a synonym of 'long').
'pe' put next to 'aches' is 'PEACHES'.
'for' acts as a link.
(Other definitions for peaches that I've seen before include "Juicy fruits" , "Producing fine specimens" , "Make a speech about the fruit" , "A speech (anag)" .)