Buzzer on the church in the wood (5)
I believe the answer is:
beech
'wood' is the definition.
(I know that beech is a type of wood)
'buzzer on the church' is the wordplay.
'buzzer' becomes 'bee' (insect which buzzes).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'the church' becomes 'ch' (abbreviation on maps etc).
'bee'+'ch'='BEECH'
'in the' acts as a link.
(Other definitions for beech that I've seen before include "Deciduous tree with smooth grey bark" , "Common forest tree" , "Tree of Fagus genus" , "Common deciduous tree" , "Tree variety" .)