Fruit & Fibre artist exchanged for hard drugs (6)
I believe the answer is:
lychee
'fruit' is the definition.
(lychee is a kind of fruit)
'fibre artist exchanged for hard drugs' is the wordplay.
I cannot really understand how this works, but
'hard' could be 'h' and 'h' is found within the answer.
'drugs' could be 'ee' (I've seen this in other clues) and 'ee' is present in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for lychee that I've seen before include "Fruit originally from China" , "Juicy Chinese fruit" , "Rough-skinned fruit" , "White-fleshed fruit" , "Popular Chinese fruit" .)