Matter over central heating, accepting temperature’s rising (6)
I believe the answer is:
putsch
'rising' is the definition.
(I've seen this before)
'matter over central heating accepting temperature's' is the wordplay.
'matter' becomes 'pus' (pus is a kind of matter).
'over' is a charade indicator (letters next to each other).
'central heating' becomes 'ch'.
'accepting' is an insertion indicator.
'temperature' becomes 't' (abbreviation).
'pus'+'ch'='pusch'
'pusch' enclosing 't' is 'PUTSCH'.
(Other definitions for putsch that I've seen before include "rising" , "Revolutionary uprising" , "Coup dtat" , "A sudden political rebellion" , "Violent attempt to overthrow a government" .)