Tropical jelly source (5)
I believe the answer is:
guava
'tropical jelly source' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for guava that I've seen before include "Large cask; tube" , "South American fruit" , "Yellow-skinned tropical fruit" , "Tropical shrub bearing small yellowish fruit" , "Pear-shaped tropical fruit" .)