Crossword Genius

As used by a writer thinking nothing? (3)

Ross

I believe the answer is:

ink

I'm a little stuck... Click here to teach me more about this clue!

'as' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'by a writer thinking nothing?' is the wordplay.
'INK' is hidden within the letters.
However, I'm unsure how this is indicated.

'used' acts as a link.

Can you help me to learn more?

(Other definitions for ink that I've seen before include "See 9" , "Liquid in pens" , "Fluid from squid" , "Writing fluid" , "Pen fluid" .)

I've seen this clue in the Evening Standard.
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