Crossword Genius

Instrument ray finds timber source (8)

Ross

I believe the answer is:

hornbeam

'timber source' is the definition.
(hornbeam is a kind of tree)

'instrument ray' is the wordplay.
'instrument' becomes 'horn' (horn is a kind of instrument).
'ray' becomes 'beam' (synonyms).
'horn'+'beam'='HORNBEAM'

'finds' acts as a link.

(Other definitions for hornbeam that I've seen before include "Timber" , "heavy plant" , "Do men abhor this tree?" , "Resident in wood perhaps" , "Tree good for hedging" .)

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