Speaking easily, trouble unfelt (6)
I believe the answer is:
fluent
'speaking easily' is the definition.
(I've seen this before)
'trouble unfelt' is the wordplay.
'trouble' indicates an anagram.
'unfelt' with letters rearranged gives 'FLUENT'.
(Other definitions for fluent that I've seen before include "Competent (of language) - graceful (of movement)" , "Expert in tongue" , "Flowing freely" , "Able to speak with facility" , "Speaking with facility" .)