Crossword Genius

Stop being faithful (7)

Ross

I believe the answer is:

staunch

I believe this is a double definition.

'stop' is the first definition.
(staunching is a kind of stopping)

'faithful' is the second definition.
(thesaurus)

'being' is the link.

(Other definitions for staunch that I've seen before include "act to stop bleeding" , "Plug" , "solid" , "Check" , "Hun acts in firm and loyal way" .)

I've seen this clue in The Guardian.
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