Tree feller elected council member (8)
I believe the answer is:
alderman
'elected council member' is the definition.
(type of council representative)
'tree feller' is the wordplay.
'tree' becomes 'alder' (alder is a kind of tree).
'feller' becomes 'man' (I've seen this in another clue).
'alder'+'man'='ALDERMAN'
(Other definitions for alderman that I've seen before include "Member of English county council" , "Former civic dignitary" , "superior member of county council" , "Member of an English city council" , "Bigwig" .)