Staffordshire river (5)
I believe the answer is:
trent
'staffordshire river' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for trent that I've seen before include "River at Newark/Stoke" , "Little Nell family; Eng. river" , "Major English river" , "Chief river of the Midlands" , "River at Stoke and Burton" .)