Steal, but lawyers win (7)
I believe the answer is:
bargain
'steal' is the definition.
('bargain' can be a synonym of 'steal')
'lawyers win' is the wordplay.
'lawyers' becomes 'bar' (I've seen this before).
'win' becomes 'gain' ('gain' can be a synonym of 'win').
'bar'+'gain'='BARGAIN'
'but' acts as a link.
(Other definitions for bargain that I've seen before include "Negotiate terms" , "Great deal!" , "Good buy" , "Agreement, deal" , "Advantageous purchase" .)