What, pay another visit? (4,5)
I believe the answer is:
come again
I believe this clue is a double definition.
'what' is the first definition.
(I've seen this before)
'pay another visit?' is the second definition.
(visit somewhere again)
(Other definitions for come again that I've seen before include "Turn out once more" , "You were great company" , "You're welcome to return - pardon?" , "I'm sorry?" , "I don't understand that" .)