Stay true (7)

I believe the answer is:

staunch

This clue is a double definition.

'stay' is the first definition.
(I've seen this before)

'true' is the second definition.
(thesaurus)

(Other definitions for staunch that I've seen before include "Trustworthy" , "Arrest" , "Faithful and true" , "Resolute" , "Firm; stem" .)

I've seen this clue in The Sun.

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