Recline under mountain pass for sheepdog (6)
I believe the answer is:
collie
'sheepdog' is the definition.
(collie is a kind of sheepdog)
'recline under mountain pass' is the wordplay.
'recline' becomes 'lie' (I've seen this before).
'under' says to put letters next to each other.
'mountain pass' becomes 'col' (col is a kind of mountain pass).
'lie' put after 'col' is 'COLLIE'.
'for' is the link.
(Other definitions for collie that I've seen before include "Breed of dog" , "Popular sheepdog like Lassie" , "Breed of sheepdog" , "Type of sheepdog" , "Silky-coated sheepdog" .)