Man keeping quiet in wood (5)
I believe the answer is:
maple
'wood' is the definition.
(I know that maple is a type of wood)
'man keeping quiet' is the wordplay.
'man' becomes 'male' ().
'keeping' is an insertion indicator.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'male' enclosing 'p' is 'MAPLE'.
'in' acts as a link.
(Other definitions for maple that I've seen before include "Hard light-coloured wood used for furniture" , "Its leaf is the emblem of 8 down" , "plant" , "Tree of the sycamore family" , "Type of syrup" .)