One easily beaten with a single punch? (6)

I believe the answer is:

rabbit

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'punch?' is the definition.
(rabbit punch is a kind of punch)

I don't understand how the remainder of the clue works.

(Other definitions for rabbit that I've seen before include "Long-eared burrowing animal" , "Inferior player" , "Come up with a solution and pull one out of the hat" , "Small mammal (not good at sports)" , "Roger, Peter or Brer" .)

I've seen this clue in the Evening Standard.

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