What a dog may do on a tree trunk? (4)
I believe the answer is:
bark
This clue could be a double definition.
'what a dog may do' is the first definition.
The definition suggests a singular noun which matches the answer.
'tree trunk?' is the second definition.
The definition and answer can be both plants as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'on a' acts as a link.
Can you help me to learn more?
(Other definitions for bark that I've seen before include "Sailing-ship" , "Dog's cry" , "Bay" , "Outer covering of tree" , "Dog's sound" .)