Turn to put four in cooking vessel (5)
I believe the answer is:
pivot
'turn' is the definition.
(I know this)
'four in cooking vessel' is the wordplay.
'four' becomes 'IV' (Roman numerals).
'in' is an insertion indicator.
'cooking vessel' becomes 'pot' (I've seen this before).
'iv' put inside 'pot' is 'PIVOT'.
'to put' is the link.
(Other definitions for pivot that I've seen before include "Pin, centre of revolution" , "Swivel" , "Kind of wine grape" , "Revolve" , "Turning pin" .)