Where you thicken stew? (7)
I believe the answer is:
kitchen
'where you' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'thicken stew?' is the wordplay.
'stew?' indicates an anagram (I've seen 'stewing' mean this).
'thicken' is an anagram of 'KITCHEN'.
Can you help me to learn more?
(Other definitions for kitchen that I've seen before include "where food is a concern" , "In workplace" , "Where heat's to be stood" , "Proverbial place of uncomfortable heat" , "Cookhouse" .)