Shrewd bargaining (5,7)
I believe the answer is:
horse trading
'shrewd bargaining' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for horse trading that I've seen before include "Ordering hats (anag) -- ordering quadrupeds?" , "Hard and shrewd bargaining" , "Hard bargaining (at yearling sales?)" , "part of stable business?" .)