Respond concerning sheet of wood (5)
I believe the answer is:
reply
'respond' is the definition.
(I know that respond can be written as reply)
'concerning sheet of wood' is the wordplay.
I cannot really understand how this works, but
'concerning' could be 're' (both can mean on a particular topic) and 're' is present in the answer.
'sheet' could be 'ply' (ply is a kind of sheet) and 'ply' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for reply that I've seen before include "Reciprocate" , "Retort" , "Counter" , "response is demanded" , "acknowledgement" .)