Writer hasn't been identified in a little while (4)

I believe the answer is:

anon

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'in a little while' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

(Other definitions for anon that I've seen before include "devoid of credit" , "At another time and with no identity, in short" , "Having no known name" , "Writer unknown" , "Soon or presently" .)

I've seen this clue in The Telegraph.

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