A cur, poor thing (6)

I believe the answer is:

wretch

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'a cur' is the definition.
(thesaurus)

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

(Other definitions for wretch that I've seen before include "A poor miserable person" , "Despicable person" , "Unfortunate, miserable person" , "A pitiful, unfortunate person" , "Someone to be pitied" .)

I've seen this clue in the Evening Standard.

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