Dicker on price (6)
I believe the answer is:
haggle
'dicker on price' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for haggle that I've seen before include "Bargain hard" , "Argue about price, dicker" , "Barter" , "Wrangle over price" , "way, to get a good price" .)