What dog may do outside of wood (4)
I believe the answer is:
bark
This clue might be a double definition.
'what dog may do outside' is the first definition.
The definition suggests a singular noun which matches the answer.
'wood' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'of' acts as a link.
Can you help me to learn more?
(Other definitions for bark that I've seen before include "Sailing-ship" , "Woof" , "Three-master - tree covering - wolf cry" , "Cri de cur?" , "Cry; surface of tree" .)