Figure a complaint to be unspecific (5)

I believe the answer is:

vague

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

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

(Other definitions for vague that I've seen before include "Amorphous" , "Obscure, undefined" , "Indefinite" , "not focused" , "Rough" .)

I've seen this clue in the Evening Standard.

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