Imitative in cheapish style (5)
I believe the answer is:
apish
'imitative' is the definition.
(similar in meaning)
'in cheapish style' is the wordplay.
'in' indicates the answer is hidden within the clue.
'APISH' can be found hidden inside 'cheapish style'.
(Other definitions for apish that I've seen before include "Foolish; simian" , "Foolish; like a monkey" , "Foppish" , "Silly" , "Stupid" .)