Crossword Genius

Try holding tree that's worthless (6)

Ross

I believe the answer is:

trashy

'worthless' is the definition.
(trashy can mean of poor quality)

'try holding tree' is the wordplay.
'holding' is an insertion indicator.
'tree' becomes 'ash' (ash is a kind of tree).
'try' placed around 'ash' is 'TRASHY'.

'that's' is the link.

(Other definitions for trashy that I've seen before include "Shy art - rubbishy" , "Shoddy or ganger" , "Useless" , "As rubbish" , "Futile" .)

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