Making clear to one, with a hint (8)
I believe the answer is:
overtone
'hint' is the definition.
(overtone can mean an implication or hint)
'making clear to one with a' is the wordplay.
'making clear' becomes 'overt' (I am not sure about this - if you are sure you should believe this answer much more).
'to one with' is a charade indicator (letters next to each other).
'a' becomes 'one'.
'overt'+'one'='OVERTONE'
Can you help me to learn more?
(Other definitions for overtone that I've seen before include "Subtle extra meaning" , "Subtle quality" , "Hint" , "part of harmonic series" , "Innuendo perhaps" .)