Sultry temperature in cupboard (6)
I believe the answer is:
closet
'cupboard' is the definition.
(synonyms)
'sultry temperature' is the wordplay.
I cannot quite understand how this works, but
'temperature' could be 't' (abbreviation) and 't' is present in the answer.
The remaining letters 'close' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for closet that I've seen before include "A small room or cupboard" , "Small room or wardrobe" , "secret is revealed" , "Cupboard (to come out of)" , "Wardrobe in the US" .)