Nothing good postponed (2,3)
I believe the answer is:
on ice
'postponed' is the definition.
(I've seen this before)
'nothing good' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'good' becomes 'nice' (similar in meaning).
'o'+'nice'='ON ICE'
(Other definitions for on ice that I've seen before include "Held in reserve" , "Postponed (fig.)" , "Suspended; chilled" , "kept for later" , "Awaiting decision" .)