Crossword Genius

Work on, as a summer camp T-shirt (3)

Ross

I believe the answer is:

dye

(Other definitions for dye that I've seen before include "Colouring material" , "Staining material" , "Hair colouring" , "Colourant" , "Soluble substance for staining or colouring" .)

I've seen this clue in The New York Times.
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