Sticky stuff in road mostly coming from lake (6)
I believe the answer is:
lagoon
'lake' is the definition.
(lagoon is a kind of lake)
'sticky stuff in road mostly' is the wordplay.
'sticky stuff' becomes 'goo' (goo is a sticky substance).
'in' indicates putting letters inside.
'road' becomes 'lane' (a lane is a small road).
'mostly' means to remove the last letter.
'lane' with its final letter removed is 'lan'.
'goo' put inside 'lan' is 'LAGOON'.
'coming from' is the link.
(Other definitions for lagoon that I've seen before include "Stretch of water within an atoll" , "A salt-water lake enclosed by reef" , "Coastal lake" , "A salt-water lake in the sea" , "Water cut off by coral reefs" .)