Inclined to be idealistic when deciphered (10)
I believe the answer is:
italicised
'inclined' is the definition.
'idealistic when deciphered' is the wordplay.
'when deciphered' is an anagram indicator.
'idealistic' with letters rearranged gives 'ITALICISED'.
'to be' acts as a link.
(Other definitions for italicised that I've seen before include "Stressed" , "Drew attention to" , "Inclined to stress" .)