Ridicules cooks (6)
I believe the answer is:
roasts
I believe this clue is a double definition.
'ridicules' is the first definition.
(I've seen this in another clue)
'cooks' is the second definition.
(roasting is a kind of cooking)
(Other definitions for roasts that I've seen before include "Cooks in dry heat" , "Has a go at" , "gets very hot" , "Cooks meat in oven" , "traditional Sunday food" .)