Backstabber (3)

I believe the answer is:

rat

'backstabber' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for rat that I've seen before include "Destructive rodent" , "Grass" , "Strike-breaker" , "Tell-tale" , "Rodent; traitor" .)

I've seen this clue in the Universal and The Telegraph.

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