Talk a lot or enter stage twice! (2,2,3,2)
I believe the answer is:
go on and on
'enter stage twice' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'talk a lot' is the wordplay.
I cannot quite understand how this works, but
'talk' could be 'goon' (going on is a kind of talking) and 'goon' is present in the answer.
'a' could be 'an' and 'an' is found in the answer.
'lot' could be 'd' and 'd' is found in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'or' acts as a link.
Can you help me to learn more?
(Another definition for go on and on that I've seen is " Talk incessantly".)