Cantaloupe castoff (4)
I believe the answer is:
rind
'cantaloupe castoff' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rind that I've seen before include "Cheese or fruit skin" , "tough skin" , "Outer edge of a bacon rasher" , "thick skin" , "Hard outer skin, of an orange say" .)