Unfortunately, my seat is hot! (6)
I believe the answer is:
steamy
'hot' is the definition.
(I've seen this before)
'unfortunately my seat' is the wordplay.
'unfortunately' is an anagram indicator.
'my'+'seat'='myseat'
'myseat' is an anagram of 'STEAMY'.
'is' is the link.
(Other definitions for steamy that I've seen before include "My seat (anag.)" , "Vaporous: lustful" , "Hot and misty" , "Passionate" , "Full of condensation; erotic (story)" .)