Food on the turn? (4)
I believe the answer is:
tack
This clue is a double definition.
'food' is the first definition.
(I've seen this before)
'the turn?' is the second definition.
(thesaurus)
'on' is the link.
(Other definitions for tack that I've seen before include "Nail for carpet?" , "Cheap material; nail" , "Small broad-headed nail" , "(Of a sailing ship) alter course through the wind" , "main course?" .)