Crossword Genius

Impossible to see (9)

Ross

I believe the answer is:

invisible

'impossible to see' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for invisible that I've seen before include "Out of sight" , "Imperceptible by the eye" , "Not able to be seen" , "Hidden - imperceptible" , "Impossible to see" .)

I've seen this clue in The Irish Times.
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