Pointedly attack Brussels bigwig (4)

I believe the answer is:

tusk

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'pointedly attack brussels bigwig' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

This is the entire clue.

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(Other definitions for tusk that I've seen before include "Elongated tooth" , "Long protruding tooth" , "Protruding ivory, of elephant say" , "Elephant's dentine" , "Walrus horn" .)

I've seen this clue in The Telegraph.

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