Go round tree that's meretricious (6)
I believe the answer is:
Here is my best explanation:
'meretricious' is the definition.
('trashy' can be a synonym of 'meretricious')
'go round tree' is the wordplay.
'go' becomes 'try' (I've seen this before**).
'round' means one lot of letters goes inside another.
'tree' becomes 'ash' (ash tree is a kind of tree).
'try' going around 'ash' is 'TRASHY'.
'that's' is the link.
(Other definitions for trashy that I've seen before include "Awful", "Cheap, shoddy", "Cheap and nasty", "Shoddy or ganger", "Futile", "Of poor quality", "Cheap and worthless", "cheap", "Of no value or quality" and "Worthless".)