He's rude and not very precise (5)
I believe the answer is:
rough
'he's rude and not very precise' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
This is all the clue.
Can you help me to learn more?
(Other definitions for rough that I've seen before include "scratchy" , "Approximate - rudimentary" , "Approximate; turbulent" , "Not level or smooth, like part of golf course" , "Boisterous - thug" .)