Initials used as an “alias” (3)

I believe the answer is:

aka

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'an alias' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for aka that I've seen before include "Notation indicating alias or other name" , "Also called (abbrev.)" , "Notation with initials indicating alternative name" , "Using the byline" , "Notation indicating alternative identity" .)

I've seen this clue in the Evening Standard.

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