Crossword Genius

How marcher's flag might be confirmed? (6)

Ross

I believe the answer is:

upheld

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'confirmed?' is the definition.
(upholding is a kind of confirming)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for upheld that I've seen before include "Supported decision or belief" , "Sustained" , "Confirmed, supported" , "Confirmed something disputed" , "Maintained (a custom)" .)

I've seen this clue in the Sydney Morning Herald.
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