Black bird in wood (4)
I believe the answer is:
bowl
'wood' is the definition.
(wood can mean a bowl in the game of bowls)
'black bird' is the wordplay.
'black' becomes 'b' (as in pencil classifications).
'bird' becomes 'owl' (owl is a kind of bird).
'b'+'owl'='BOWL'
'in' is the link.
(Other definitions for bowl that I've seen before include "See 20" , "Soup dish - roll a ball" , "Deliver - item of pottery" , "Play with tenpins" , "Basin; attack wicket" .)