Looking on the bright side of italicised letters (10)

I believe the answer is:

idealistic

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'looking on the bright side' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'italicised letters' is the wordplay.
'letters' is an anagram indicator.
'italicised' is an anagram of 'IDEALISTIC'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for idealistic that I've seen before include "Naively impractical" , "Impracticable" , "Visionary" , "Seeking the best" , "Striving for perfection" .)

I've seen this clue in the Sydney Morning Herald.

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