West Country river (3)
'west country river' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for severn that I've seen before include "Gloucester's river" , "Flower" , "Longest river in Britain" , "West Country river" , "Longest British river" .)
'west country river' is the definition.
(the River Exe)
This is the entire clue.
(Other definitions for exe that I've seen before include "Tiverton's river" , "Topsham's river" , "Devon river" , "West Country river" , "source of water" .)