Attempt to include fancy wad that's cheap and showy (6)
I believe the answer is:
tawdry
'cheap and showy' is the definition.
(I've seen this before)
'attempt to include fancy wad' is the wordplay.
'attempt to' becomes 'try' (I've seen this in other clues).
'include' is an insertion indicator.
'fancy' indicates an anagram.
'wad' is an anagram of 'awd'.
'try' enclosing 'awd' is 'TAWDRY'.
'that's' acts as a link.
(Other definitions for tawdry that I've seen before include "Tastelessly showy" , "Showy but cheap and nasty" , "Cheap and shoddy" , "Gaudy but valueless (6)" , "Cheap; sleazy" .)