Concerned with listeners he embraces in practice (8)
I believe the answer is:
rehearse
'practice' is the definition.
(I know that practice can be written as rehearse)
'concerned with listeners he embraces' is the wordplay.
'concerned with' becomes 're' (re can mean regarding, concerning).
'listeners' becomes 'ears' (I've seen this in another clue).
'embraces' is an insertion indicator.
'ears' put into 'he' is 'hearse'.
're'+'hearse'='REHEARSE'
'in' acts as a link.
(Other definitions for rehearse that I've seen before include "Practise before performing in public" , "Practise like actor" , "Practice in theatre" , "prepare for performance" , "What actor does to prepare for play" .)