Crossword Genius

Fountain-pen filler (3)

Ross

I believe the answer is:

ink

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

This is all the clue.

(Other definitions for ink that I've seen before include "Liquid used in printing" , "Printer's medium" , "Dark liquid" , "Writing fluid" , "It is ejected by cuttlefish" .)

I've seen this clue in The Sun and the Newsday.com.
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