Bury loose cash at a road junction (11)
I believe the answer is:
interchange
'a road junction' is the definition.
(I've seen this before)
'bury loose cash' is the wordplay.
'bury' becomes 'inter' (to inter is to put into the ground).
'loose cash' becomes 'change' (coins).
'inter'+'change'='INTERCHANGE'
'at' is the link.
(Other definitions for interchange that I've seen before include "Old truck" , "where roads meet" , "trade" , "station?" , "switch" .)