Passage in the valleys (5)
I believe the answer is:
alley
'passage' is the definition.
(I've seen this in other clues)
'in the valleys' is the wordplay.
'in' indicates a hidden word.
'ALLEY' is hidden within 'valleys'.
(Other definitions for alley that I've seen before include "Narrow back street" , "Bowling lane" , "space in US court" , "garden path" , "Narrow lane; type of cat" .)