Come with coin for a change -- it's cheap (8)
I believe the answer is:
economic
'cheap' is the definition.
(I've seen this before)
'come with coin for a change' is the wordplay.
'with' is a charade indicator (letters next to each other).
'for a change' is an anagram indicator.
'come' after 'coin' is 'coincome'.
'coincome' anagrammed gives 'ECONOMIC'.
'it's' acts as a link.
(Other definitions for economic that I've seen before include "Using the minimum resources necessary for effectiveness" , "Productive: financially sound" , "viable" , "Capable of operating at a profit" , "Fiscal" .)