Dog found where railway leaves the mine (6)
I believe the answer is:
collie
'dog' is the definition.
(collie is a kind of dog)
'railway leaves the mine' is the wordplay.
'railway' becomes 'ry' (abbreviation for railway).
'leaves' indicates named letters should be taken away.
'the mine' becomes 'colliery' (a colliery is a coal mine).
'colliery' with 'ry' taken out is 'COLLIE'.
'found where' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for collie that I've seen before include "Popular kind of sheepdog" , "Border dog" , "Long-haired sheepdog" , "See 2" , "Farm dog" .)