Animals following King George for fruit (6)
I believe the answer is:
grapes
'for fruit' is the definition.
(grapes are fruit)
'animals following king george' is the wordplay.
'animals' becomes 'apes' (ape is a kind of animal).
'following' means one lot of letters go next to another.
'king george' becomes 'gr' (Georgius Rex).
'apes' put after 'gr' is 'GRAPES'.
(Other definitions for grapes that I've seen before include "John Steinbeck wrote 'The . . . . . . of Wrath'" , "Source of wine" , "'Green, black or purple clusters (6)'" , "Fruit that grows in clusters" , "They grow on vines" .)