Arrangement of mostly tropical fruit (7)
I believe the answer is:
apricot
'fruit' is the definition.
(apricot is a kind of fruit)
'arrangement of mostly tropical' is the wordplay.
'arrangement of' is an anagram indicator.
'mostly' means to remove the last letter.
'tropical' with its final letter taken off is 'tropica'.
'tropica' is an anagram of 'APRICOT'.
(Other definitions for apricot that I've seen before include "Yellow fruit" , "Orange fruit" , "Yellowish fruit like a small peach" , "Juicy fruit" , "Juicy stone-fruit, orange-pink when ripe" .)