Crossword Genius

Rinse out sap (5)

Ross

I believe the answer is:

resin

'sap' is the definition.
(I've seen this before)

'rinse out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'rinse' anagrammed gives 'RESIN'.

(Other definitions for resin that I've seen before include "varnish, perhaps" , "component of varnish" , "Viscous fluid from tree sap" , "Unprocessed pine secretion" , "Sticky substance exuded by pine trees" .)

I've seen this clue in The Mirror.
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