Present on a podcast twice? I agree! (4,4)
I believe the answer is:
hear hear
'i agree' is the definition.
('hear hear' is said to indicate agreement)
'present on a podcast twice?' is the wordplay.
'present' becomes 'here' (both can mean in attendance).
'on a podcast' shows a homophone (sound like).
'twice?' becomes 'hear' (I can't justify this - if you can you should give a lot more credence to this answer).
'here' is a homophone of 'hear'.
'hear'+'hear'='HEAR HEAR'
(Other definitions for hear hear that I've seen before include "Repeatedly try" , "Show of approval" , "Well said!" , "sound supportive" , "I totally agree" .)