Fascinated, talked out loud (4)
I believe the answer is:
rapt
'fascinated' is the definition.
(thesaurus)
'talked out loud' is the wordplay.
'talked' becomes 'rapped' (rapping is a kind of talking).
'out loud' shows a homophone (sound like).
'rapped' is a homophone of 'RAPT'.
(Other definitions for rapt that I've seen before include "'Transported, entranced (4)'" , "Spellbound, enthralled" , "Engrossed, spellbound" , "Very attentive" , "Enraptured, entranced" .)