Crossword Genius

Mark and Stanley getting out of line (5)

Ross

I believe the answer is:

stain

I'm a little stuck... Click here to teach me more about this clue!

'mark' is the definition.
(I know that mark can be written as stain)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for stain that I've seen before include "Smear" , "Discolour - blemish" , "Dirty mark; dye" , "Tarnish" , "Stigma" .)

I've seen this clue in the Evening Standard.
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