Crossword Genius

Writes one's first letters (8)

Ross

I believe the answer is:

initials

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'first letters' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for initials that I've seen before include "Signs briefly" , "First letters as of names" , "Components of an acronym" , "Lisa in it (anag)" .)

I've seen this clue in The Guardian and The Globe and Mail.
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