OK, so nothing left? (3,5)
I believe the answer is:
all right
I believe this is a double definition.
'ok' is the first definition.
(synonyms)
'nothing left?' is the second definition.
(I've seen this before)
'so' acts as a link.
(Other definitions for all right that I've seen before include "Completely one-sided" , "Yes - adequate" , "Satisfactory; allowable" , "Very well, whatever you say" , "Perfect exam performance" .)