Peel ’n’ a pip has the makings of a fruit (9)
I believe the answer is:
pineapple
'a fruit' is the definition.
(pineapple is a kind of fruit)
'peel n a pip has the makings of' is the wordplay.
'has the makings of' is an anagram indicator (the anagram can be used to make the solution).
'peel'+'n'+'a'+'pip'='peelnapip'
'peelnapip' anagrammed gives 'PINEAPPLE'.
(Other definitions for pineapple that I've seen before include "that might go off?" , "Large fleshy fruit with a tuft of stiff leaves" , "One may go off" , "Fruit (tree and fruit!)" , "bomb" .)