Negotiate, bargain (6)
I believe the answer is:
haggle
I believe this clue is a double definition.
'negotiate' is the first definition.
(I know that haggle is a more specific form of bargain)
'bargain' is the second definition.
(I know that haggle is a more specific form of bargain)
(Other definitions for haggle that I've seen before include "Negotiate the price" , "Wrangle over price" , "Try to drive a bargain" , "Dispute about price" , "Barter" .)