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The more they cut down, the more they gain (10)

Ross

I believe the answer is:

harvesters

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'the more they' is the definition.
The definition suggests a plural noun which matches the answer.

'cut down the more they gain' is the wordplay.
'cut down' becomes 'harvest' (I've seen this before).
'the more they gain' becomes 'ers' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'harvest'+'ers'='HARVESTERS'

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I've seen this clue in The Globe and Mail.
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