Prune weed (4)

I believe the answer is:

dock

I believe this clue is a double definition.

'prune' is the first definition.
(thesaurus)

'weed' is the second definition.
(type of weed)

(Other definitions for dock that I've seen before include "Harbour" , "Where a prisoner is situated in court" , "Remove or shorten an animal's tail" , "Take pay from" , "Where the accused is placed in court" .)

I've seen this clue in The Times.

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