Crossword Genius

Deck application (5)

Ross

I believe the answer is:

stain

'deck application' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for stain that I've seen before include "Penetrative dye; mark" , "Satin (anag.)" , "Stigma" , "Discoloured patch" , "Unsightly mark" .)

I've seen this clue in the LA Times, The Wall Street Journal and the Universal.
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