Crossword Genius

The wood is left brown (6)

Ross

I believe the answer is:

lumber

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

'left brown' is the wordplay.
'left' becomes 'l' (common abbreviation).
'brown' becomes 'umber' (umber is a kind of brown).
'l'+'umber'='LUMBER'

'is' is the link.

(Other definitions for lumber that I've seen before include "Unwanted furniture" , "Sawn wood ready for use" , "Move clumsily - Jack's wood?" , "Sawn timber" , "Move awkwardly - unwanted household items" .)

I've seen this clue in The Irish Independent.
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