Pains after exercise? Fruit is the answer! (7)
I believe the answer is:
peaches
'fruit is the answer' is the definition.
I can't tell whether this definition defines the answer.
'pains after exercise?' is the wordplay.
'pains' becomes 'aches' (ache is a kind of pain).
'after' means one lot of letters go next to another.
'exercise?' becomes 'pe' (Physical Education).
'aches' after 'pe' is 'PEACHES'.
Can you help me to learn more?
(Other definitions for peaches that I've seen before include "Juicy fruits" , "Make a speech about the fruit" , "A speech (anag)" , "Producing fine specimens" .)