Nothing appealing is postponed (2,3)
I believe the answer is:
on ice
'is postponed' is the definition.
(I've seen this before)
'nothing appealing' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'appealing' becomes 'nice'.
'o'+'nice'='ON ICE'
(Other definitions for on ice that I've seen before include "Halted for a while" , "Predatory insect" , "kept for later" , "Postponed (fig.)" , "In abeyance" .)