Negotiated with lawyers - and won! (9)
I believe the answer is:
bargained
'negotiated' is the definition.
(bargaining is a kind of negotiating)
'lawyers and won' is the wordplay.
'lawyers' becomes 'bar' (I've seen this before).
'and' means one lot of letters go next to another.
'won' becomes 'gained' ('gain' can be a synonym of 'win').
'bar'+'gained'='BARGAINED'
'with' is the link.
(Other definitions for bargained that I've seen before include "haggled" , "Negotiated" .)