Suffocating temperature in cupboard (6)
I believe the answer is:
closet
'cupboard' is the definition.
(type of cupboard)
'suffocating temperature' is the wordplay.
I cannot really see how this works, but
'temperature' could be 't' (abbreviation) and 't' is found within the answer.
The remaining letters 'close' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for closet that I've seen before include "Covert" , "Shut away in private conference - in small room?" , "Small room or wardrobe" , "secret is revealed" , "Small cupboard or recess" .)