Ear picked up choir in valley (5)
I believe the answer is:
gulch
'valley' is the definition.
(I know that gulch is a type of gorge)
'ear picked up choir' is the wordplay.
'ear' becomes 'lug' (informal term for an ear).
'picked up' shows that the letters should be reversed in order.
'choir' becomes 'ch' (abbreviation).
'lug' backwards is 'gul'.
'gul'+'ch'='GULCH'
'in' acts as a link.
(Other definitions for gulch that I've seen before include "Narrow ravine (Amer.)" , "valley" , "Narrow gorge with a stream in North America" , "Narrow ravine (US)" , "American ravine" .)