Stuff that's promised for tomorrow? (3)
I believe the answer is:
jam
I believe this is a double definition.
'stuff' is the first definition.
(synonyms)
'that's promised for tomorrow?' is the second definition.
(reference to the phrase 'jam tomorrow')
(Other definitions for jam that I've seen before include "problem" , "Spread; improvise (jazz)" , "Conserve" , "Troublesome situation" , "awful traffic" .)