Sounds like crow calls bear down on crossing (8)
I believe the answer is:
causeway
'crossing' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'sounds like crow calls bear down' is the wordplay.
'sounds like' shows a homophone (sound like).
'crow calls' becomes 'caws' (I've seen this in another clue).
'bear down' becomes 'way' (I can't justify this - if you can you should believe this answer much more).
'caws' sounds like 'cause'.
'cause'+'way'='CAUSEWAY'
'on' acts as a link.
Can you help me to learn more?
(Other definitions for causeway that I've seen before include "Raised road across wet area" , "Raised road across low or wet ground" , "Paved footpath" , "Raised road crossing shallow water" , "Raised road or track" .)