Aggressive dog (3)

I believe the answer is:

cur

'aggressive dog' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for cur that I've seen before include "Aggressive dog" , "Mongrel; rascal" , "Inferior dog or one of mixed breed" , "Useless dog" , "Vicious dog" .)

I've seen this clue in The Times and The Daily Mail.

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