Convolvulus (8)
I believe the answer is:
bindweed
'convolvulus' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bindweed that I've seen before include "Convolvulus" , "Be winded (anag.)" , "Twining invasive plant" , "Strangler" , "Gardener's bane - widen bed (anag)" .)