Bury branch junction (12)
I believe the answer is:
intersection
'junction' is the definition.
(I know that intersection is a type of junction)
'bury branch' is the wordplay.
'bury' becomes 'inter' (to inter is to put into the ground).
'branch' becomes 'section' (I've seen this before).
'inter'+'section'='INTERSECTION'
(Other definitions for intersection that I've seen before include "Crossing - junction" , "Crossing point" , "Motorway junction" , "Where two lines cross" .)