Firm haggles regularly producing likeness (5)
I believe the answer is:
image
'likeness' is the definition.
(I've seen this before)
'firm haggles regularly' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'firm'+'haggles'='firmhaggles'
The alternating letters of 'firmhaggles' are 'IMAGE'.
'producing' acts as a link.
(Other definitions for image that I've seen before include "Public persona" , "Copy" , "Dead ringer" , "Picture; simile" , "Likeness or mental picture" .)