Member got stuck into representative (6)
I believe the answer is:
legate
'representative' is the definition.
(legate is a kind of representative)
'member got stuck into' is the wordplay.
'member' becomes 'leg' (member can mean a limb).
'got stuck into' becomes 'ate' (to get stuck into can mean to eat).
'leg'+'ate'='LEGATE'
(Other definitions for legate that I've seen before include "Emissary representing the Pope" , "messenger for the Pope" , "Papal envoy from Galtee" , "Envoy - pope's representative" , "Official representative" .)