Mixture of mostly tropical fruit (7)
I believe the answer is:
apricot
'fruit' is the definition.
(type of fruit)
'mixture of mostly tropical' is the wordplay.
'mixture of' is an anagram indicator (I've seen this in other clues).
'mostly' means to remove the last letter.
'tropical' with its last letter taken off is 'tropica'.
'tropica' is an anagram of 'APRICOT'.
(Other definitions for apricot that I've seen before include "Asian fruit" , "I part co with the fruit" , "Juicy stone-fruit related to plum and peach" , "Juicy stone-fruit, orange-pink when ripe" , "Stoned fruit" .)