River runs through shelter (5)
I believe the answer is:
trent
'river' is the definition.
(River Trent)
'runs through shelter' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'through' indicates putting letters inside (inserted letters go through the word).
'shelter' becomes 'tent' (canvas shelter).
'r' placed inside 'tent' is 'TRENT'.
(Other definitions for trent that I've seen before include "River that joins the Ouse to form the Humber" , "Major English river" , "Little Nell family; Eng. river" , "Notts. river" , "Chief river of the Midlands" .)