Harmonious character? (9)
I believe the answer is:
consonant
I believe this clue is a double definition.
'harmonious' is the first definition.
(similar in meaning)
'character?' is the second definition.
(type of letter or character)
(Other definitions for consonant that I've seen before include "In agreement" , "B, C, D or F, perhaps?" , "One of several characters" , "sounding well together" , "Speech sound, not a vowel" .)