Crossword Genius

Pen fluid (3)

Ross

I believe the answer is:

ink

'pen fluid' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for ink that I've seen before include "Dark liquid" , "Cuttlefish defence" , "Printer's medium" , "Liquid from a squid" , "Liquid used to write" .)

I've seen this clue in The New York Times, the Penny Press, the Evening Standard, the USA Today, The Mirror and The Star Tribune.
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