Cook with right hop kiln (5)
I believe the answer is:
roast
'cook' is the definition.
(roasting is a kind of cooking)
'with right hop kiln' is the wordplay.
'with' means one lot of letters go next to another.
'right' becomes 'r' (common abbreviation).
'hop kiln' becomes 'oast' (I've seen this before).
'r' put next to 'oast' is 'ROAST'.
(Other definitions for roast that I've seen before include "Large piece of oven-cooked meat" , "& 3 Accompaniment to Yorkshire pudding?" , "Become very warm" , "Oven joint" , "Sunday dinner" .)