Crossword Genius

Trees on the bowling green? (4)

Ross

I believe the answer is:

wood

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'trees on' is the definition.
'wood' can be an answer for 'trees'. I'm unsure of the 'on' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for wood that I've seen before include "celebrated conductor" , "'Under Milk - - ' (lit.)" , "Large group of trees" , "Trees; club" , "What you might need to play golf" .)

I've seen this clue in the Evening Standard.
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