Hot in pleasant corner (5)
I believe the answer is:
niche
'corner' is the definition.
('niche' can be a synonym of 'corner')
'hot in pleasant' is the wordplay.
'hot' becomes 'h'.
'in' is an insertion indicator.
'pleasant' becomes 'nice' ('nice' is associated in meaning with 'pleasant').
'h' put into 'nice' is 'NICHE'.
(Other definitions for niche that I've seen before include "comfortable situation" , "Place that's cosy" , "Recess - alcove" , "ideal position" , "Small corner of e.g. market" .)