Old king gets primate some fruit (5)
I believe the answer is:
grape
'some fruit' is the definition.
(grape is a kind of fruit)
'old king gets primate' is the wordplay.
'old king' becomes 'GR' (Georgius Rex, Latin for King George).
'gets' is a charade indicator (letters next to each other).
'primate' becomes 'ape' (ape is a kind of primate).
'gr'+'ape'='GRAPE'
(Other definitions for grape that I've seen before include "Pager (anag.)" , "Vine fruit" , "Wine fruit" , "Small fruit; type of shot" , "Green/black fruit" .)