Crossword Genius

Use sound trees (4)

Ross

I believe the answer is:

yews

'trees' is the definition.
(yew is a kind of tree)

'use sound' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'use' sounds like 'YEWS'.

(Other definitions for yews that I've seen before include "Evergreen trees" , "woods" , "traditional churchyard residents" .)

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