Lacking taste or style (4)
I believe the answer is:
naff
'lacking taste or style' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for naff that I've seen before include "In bad taste" , "Inferior - vulgar" , "Meant to be showy, but in poor taste" , "socially awkward" , "Of dubious taste" .)