The charm of a masterly Caledonian (6)

I believe the answer is:

mascot

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'the charm' is the definition.
(synonyms)

'masterly caledonian' is the wordplay.
'masterly' becomes 'ma' (I can't explain this - if you can you should give a lot more credence to this answer).
'caledonian' becomes 'Scot' (Caledonia was the Latin name for Scotland).
'ma'+'scot'='MASCOT'

'of a' is the link.

Can you help me to learn more?

(Other definitions for mascot that I've seen before include "Lucky person" , "Symbolic lucky figure" , "Lucky talisman" , "It is believed to bring good luck to its owner(s)" , "Something bringing luck" .)

I've seen this clue in the Evening Standard.

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