Tomorrow's sweet promise? (3)
I believe the answer is:
jam
This clue could be a double definition.
'tomorrow's sweet' is the first definition.
'jam' can be an answer for 'sweet' (jam is a kind of sweet). I am not sure about the 'tomorrow's' bit.
'promise?' is the second definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Maybe you can see a link between them that I can't see?
Can you help me to learn more?
(Other definitions for jam that I've seen before include "Preserve; pack tightly" , "awful traffic" , "Sweet stuff for bread - stuff it in" , "problem" , "Troublesome situation" .)