Is interrupting the speaker about repeated plea for mercy (8)
I believe the answer is:
miserere
'plea for mercy' is the definition.
(I've seen this before)
'is interrupting the speaker about repeated' is the wordplay.
'is interrupting the speaker' becomes 'mise' (I am not sure about this - if you are sure you should believe this answer much more).
'about' becomes 're' (regarding).
'repeated' shows that letters should be duplicated.
're' duplicated is 'rere'.
'mise'+'rere'='MISERERE'
Can you help me to learn more?
(Other definitions for miserere that I've seen before include "appeal for mercy" , "Mercy Seat" , "Psalm seeking mercy" , "plea for mercy" , "Setting of Psalm fifty one" .)