A trotter for cooking? (5)
I believe the answer is:
afoot
'cooking?' is the definition.
(both can mean in progress)
'a trotter' is the wordplay.
'trotter' becomes 'foot' (a trotter is a pig's foot).
'a'+'foot'='AFOOT'
'for' acts as a link.
(Other definitions for afoot that I've seen before include "In the pipeline" , "Making progress" , "Stirring" , "in preparation" , "Currently in progress" .)