Crossword Genius

Mark the colour of the blocks here for printing. (6)

Ross

I believe the answer is:

inkjet

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If this is the answer I cannot explain how the clue works.

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(Other definitions for inkjet that I've seen before include "and 20 Across: Type of computer accessory" , "Type of office printer" , "Printer powered by a liquid engine" , "Type of electronic printing" , "Kind of printer" .)

I've seen this clue in The Irish Times.
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