About to grasp what listeners go through (8)
I believe the answer is:
rehearse
'go through' is the definition.
(thesaurus)
'about to grasp what listeners' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'to grasp' is an insertion indicator.
'what' becomes 'eh' (sound used to ask 'what?' or 'pardon?').
'listeners' becomes 'ears' (body parts which listen).
'eh'+'ears'='ehears'
're' going around 'ehears' is 'REHEARSE'.
(Other definitions for rehearse that I've seen before include "Practise play in theatre" , "Go over" , "Prepare for a stage production" , "prepare for performance" , "Practise before a public performance" .)