A blend of mostly tropical fruit (7)
I believe the answer is:
apricot
'fruit' is the definition.
(apricot is a kind of fruit)
'a blend of mostly tropical' is the wordplay.
'a blend of' is an anagram indicator (I've seen this in other clues).
'mostly' means to remove the last letter.
'tropical' with its last letter removed is 'tropica'.
'tropica' with letters rearranged gives 'APRICOT'.
(Other definitions for apricot that I've seen before include "Orange-coloured fruit" , "shade" , "Small, peach-like fruit" , "Juicy stone-fruit related to plum and peach" , "Luscious fruit" .)