Supplied Liberal with hammer (5)
I believe the answer is:
gavel
'hammer' is the definition.
(gavel is a kind of hammer)
'supplied liberal' is the wordplay.
'supplied' becomes 'gave' (giving is a kind of supplying).
'liberal' becomes 'l' (abbreviation).
'gave'+'l'='GAVEL'
'with' is the link.
(Other definitions for gavel that I've seen before include "Ceremonial mallet" , "Small mallet" , "Small hammer" , "equipment for auctioneer" , "An auctioneer's wooden hammer" .)