Hear about wood that's cheap (6)
I believe the answer is:
trashy
'cheap' is the definition.
('trashy' can be a synonym of 'cheap')
'hear about wood' is the wordplay.
'hear' becomes 'try' ('try' can be a synonym of 'hear').
'about' means one lot of letters goes inside another.
'wood' becomes 'ash' (I've seen this before).
'try' enclosing 'ash' is 'TRASHY'.
'that's' acts as a link.
(Other definitions for trashy that I've seen before include "Cheap and worthless" , "Cheap, shoddy" , "Futile" , "Of no value or quality" , "Cheap and nasty" .)