Cheap substitute or imitation (6)
I believe the answer is:
ersatz
I believe this clue is a double definition.
'cheap substitute' is the first definition.
(I've seen this before)
'imitation' is the second definition.
(synonyms)
(Other definitions for ersatz that I've seen before include "unnatural" , "Mock" , "being of inferior quality" , "Made in imitation - in Germany" , "inferior type" .)