Crossword Genius

With hair up, French girl meeting king is one putting on a pretty coat (9)

Ross

I believe the answer is:

enameller

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'putting on a pretty coat' is the definition.
The definition suggests a singular noun which matches the answer.

'with hair up french girl meeting king is one' is the wordplay.
I cannot quite see how this works, but
'girl' could be 'elle' and 'elle' is present in the answer.
'king' could be 'r' (abbreviation of Latin rex) and 'r' is found within the answer.
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for enameller that I've seen before include "Who lacquers" , "Decorative artist" , "Craftsman" , "One decorating with glassy coatings" , "One applying vitrified coating" .)

I've seen this clue in The Guardian.
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