Crossword Genius

As used in writing a pointed article? (3)

Ross

I believe the answer is:

pen

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This clue could be a double definition.

'as' is the first definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'writing a pointed article?' is the second definition.
'pen' can be an answer for 'writing' (thesaurus). I am unsure of the 'a pointed article?' bit.

'used in' is the link.

Can you help me to learn more?

(Other definitions for pen that I've seen before include "Writing tool" , "Prison" , "International Association of poets, playwrights etc" , "Put down" , "Swan for the writer" .)

I've seen this clue in the Evening Standard.
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