Send message to jam makers about excellent setter (4)
I believe the answer is:
wire
'send' is the 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 an association between them that I don't see?
'message to jam makers about excellent setter' is the wordplay.
I cannot really understand how this works, but
'about' could be 're' ('re' means regarding or about) and 're' is found within the answer.
'setter' could be 'i' (the person who set this crossword) and 'i' is found in the answer.
A single letter 'w' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for wire that I've seen before include "Thin drawn metal" , "See 2" , "Drawn-out metal" , "Metal fastener" , "Telegram about the fencing material" .)