Message from berth in pub, perhaps, something sharp (6,4)
I believe the answer is:
barbed wire
'sharp' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'message from berth in pub perhaps something' is the wordplay.
I cannot really see how this works, but
'message' could be 'wire' (wire is a kind of message) and 'wire' is present in the answer.
'berth' could be 'bed' and 'bed' is present in the answer.
'pub' could be 'bar' (both are drinking establishments) and 'bar' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for barbed wire that I've seen before include "warning to keep out" , "Spiked barrier" , "something to prevent you moving on!" , "Deterrent fencing" , "may well put off intruders" .)