Crossword Genius

Squid's defense (3)

Ross

I believe the answer is:

ink

'squid's defense' 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 "Pen fluid" , "Writing material" , "form of writing" , "Cuttlefish defence" , "It is ejected by cuttlefish" .)

I've seen this clue in the Penny Press and the Universal.
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