Crossword Genius

Country customs one’s misquoted at first in slanted script (10)

Ross

I believe the answer is:

italicisms

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'country customs one's' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'misquoted at first in slanted script' is the wordplay.
'misquoted at first' becomes 'is' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'slanted' becomes 'italic' (I've seen this in another clue).
'script' becomes 'ms' (I've seen this in other clues).
'italic'+'ms'='italicms'
'is' placed within 'italicms' is 'ITALICISMS'.

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I've seen this clue in The Times.
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