Hold member's parting drink (6)
I believe the answer is:
allege
'hold' is the definition.
(both can mean to claim or maintain)
'member's parting drink' is the wordplay.
'member' becomes 'leg' (member can mean a limb).
'parting' is an insertion indicator.
'drink' becomes 'ale' (type of beer).
'leg' put inside 'ale' is 'ALLEGE'.
(Other definitions for allege that I've seen before include "Cite in discussion" , "Claim, suggest" , "State as a fact without proof" , "Accuse without established proof" , "Swear" .)