Crossword Genius

What makes one blush, showing some change of heart? Behaving badly (5)

Ross

I believe the answer is:

rogue

'behaving badly' is the definition.
(as in a rogue state, a nation behaving badly)

I don't understand how the remainder of the clue works.

(Other definitions for rogue that I've seen before include "Prankster" , "Deceitful and unreliable scoundrel" , "A dishonest or unprincipled person" , "Scoundrel, knave" , "Rascal or reprobate" .)

I've seen this clue in The Independent.
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