Cocktail of endless tropical fruit (7)
I believe the answer is:
apricot
'fruit' is the definition.
(type of fruit)
'cocktail of endless tropical' is the wordplay.
'cocktail of' indicates an anagram (a mixture of the letters).
'endless' means to remove the last letter.
'tropical' with its final letter removed is 'tropica'.
'tropica' anagrammed gives 'APRICOT'.
(Other definitions for apricot that I've seen before include "Rip coat (anag) - fruit" , "Juicy stone-fruit, orange-pink when ripe" , "shade" , "Orange fruit" , "Orange-yellow fruit in plum family" .)