It burns waste and rubbish lying around church (9)
I believe the answer is:
blowtorch
'it burns' is the definition.
(tool which burns things)
'waste and rubbish lying around church' is the wordplay.
'waste' becomes 'blow' (synonyms).
'and' is a charade indicator (letters next to each other).
'rubbish' becomes 'rot' (both can mean nonsense).
'lying around' says the letters should be written backwards.
'church' becomes 'ch' (common abbreviation).
'rot' written backwards gives 'tor'.
'blow'+'tor'+'ch'='BLOWTORCH'
(Other definitions for blowtorch that I've seen before include "Device with an intense flame for stripping paint" , "Paint stripper" , "Paint remover" , "tool?" , "Small burner with a very hot flame" .)