Trick where fruit turns into stone (5)
I believe the answer is:
stunt
'trick' is the definition.
(thesaurus)
'fruit turns into stone' is the wordplay.
'fruit' becomes 'nut' (nut is a kind of fruit**).
'turns' says the letters should be written backwards.
'into' is an insertion indicator.
'stone' becomes 'st'.
'nut' in reverse letter order is 'tun'.
'tun' going into 'st' is 'STUNT'.
'where' acts as a link.
(Other definitions for stunt that I've seen before include "Daring act - cause not to develop" , "Dwarf" , "Exhibitionistic performance" , "Spectacularly daring action; retard growth" , "Hamper - exploit" .)