Crossword Genius

Pass our flag (6)

Ross

I believe the answer is:

colour

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'flag' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?

'pass our' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'col'+'our'='COLOUR'

Can you help me to learn more?

(Other definitions for colour that I've seen before include "Red or green, say" , "Blue or green, say" , "Such a sergeant" , "'Tinge, hue (6)'" , "Complexion - pretext" .)

I've seen this clue in The Guardian.
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