A light “A member? Not me” (5)
I believe the answer is:
amber
'a light' is the definition.
(I've seen this before)
'a member? not me' is the wordplay.
'not' is a deletion indicator.
'member' with 'me' taken out is 'mber'.
'a'+'mber'='AMBER'
(Other definitions for amber that I've seen before include "Fossil resin used in jewellery" , "Honey-yellow colour" , "Prepare-to-stop signal" , "Fossilised resin used in jewellery" , "gives warning" .)