Perhaps emphasised letters seen as unusually idealistic (10)
I believe the answer is:
italicised
'perhaps emphasised' is the definition.
'italicised' can be an answer for 'emphasised' ('emphasized'->'italicized' is in my internal thesaurus and 'ize'->'ise'). I'm unsure of the 'perhaps' bit.
'letters seen as unusually idealistic' is the wordplay.
'idealistic' anagrams to 'ITALICISED'.
But, I'm not clear how this is indicated.
Can you help me to learn more?
(Other definitions for italicised that I've seen before include "Drew attention to" , "Inclined to stress" , "Stressed" .)