Present in audition with encore? Absolutely! (4,4)
I believe the answer is:
hear hear
'absolutely' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'present in audition with encore?' is the wordplay.
'present' becomes 'here' (both can mean in attendance).
'in audition' shows a homophone (sound like) (audition can mean hearing).
'with' means one lot of letters go next to another.
'encore?' becomes 'hear' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'here' sounds like 'hear'.
'hear'+'hear'='HEAR HEAR'
Can you help me to learn more?
(Other definitions for hear hear that I've seen before include "Agreed" , "express approval" , "Expression of agreement with something said" , "Words of agreement" , "I strongly approve" .)