Romantic slur italicised (10)

I believe the answer is:

idealistic

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'romantic' is the definition.
(I've seen this in another clue)

'slur italicised' is the wordplay.
'italicised' can be anagrammed to 'IDEALISTIC'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for idealistic that I've seen before include "Seeking the best" , "Naively impractical" , "Visionary" , "High-minded - italicised (anag)" , "Utopian" .)

I've seen this clue in The Telegraph.

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