Scoundrel smudges rouge (5)

I believe the answer is:

rogue

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

'scoundrel' is the definition.
(I know that rogue is a type of scoundrel)

'smudges rouge' is the wordplay.
'rouge' can be anagrammed to 'ROGUE'.
Though, I'm not sure how this is indicated.

Can you help me to learn more?

(Other definitions for rogue that I've seen before include "Deceitful and unreliable scoundrel" , "Scoundrel, knave" , "Bad guy" , "one behaving atypically" , "Dishonest chap; solitary (elephant)" .)

I've seen this clue in The Sun.

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