Crossword Genius

Pen filler (3)

Ross

I believe the answer is:

ink

'pen filler' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ink that I've seen before include "Fluid from cuttlefish" , "Printer's medium" , "Writing liquid" , "Material used in printing" , "Liquid used to write" .)

I've seen this clue in the King Feature Syndicate, the Universal, the Penny Press, the Sydney Morning Herald and the LA Times.
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