Does it moan when the gardener pulls it up? (8)

I believe the answer is:

bindweed

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'it up?' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the rest of the clue.

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(Other definitions for bindweed that I've seen before include "Strangler" , "Twining invasive plant" , "Gardener's bane - widen bed (anag)" , "Be winded (anag.)" , "Convolvulus" .)

I've seen this clue in the Evening Standard.

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