Talked rhythmically, sounding ecstatic (6)
I believe the answer is:
rapped
'talked rhythmically' is the definition.
(I've seen this before)
'sounding ecstatic' is the wordplay.
'sounding' shows a homophone (sound like).
'ecstatic' becomes 'rapt' (I've seen this in another clue).
'rapt' sounds like 'RAPPED'.
(Other definitions for rapped that I've seen before include "Performed a kind of music" , "Struck" , "Spoke rhyming monologue to rock music" , "Severely criticised" , "Talked rhythmically" .)