Hot stuff, politician in private chamber (8)
I believe the answer is:
lavatory
'private chamber' is the definition.
(I've seen this before)
'hot stuff politician' is the wordplay.
'hot stuff' becomes 'lava' (I've seen this in another clue).
'politician' becomes 'tory' (term for a Conservative Party politician).
'lava'+'tory'='LAVATORY'
'in' is the link.
(Other definitions for lavatory that I've seen before include "Toilet" , "Private chamber" , "somewhere to go?" , "John for American" , "Something to go on" .)