Housed around river (4)
I believe the answer is:
ouse
'river' is the definition.
(Yorkshire river)
'housed around' is the wordplay.
'around' says the answer is hidden in the clue.
'OUSE' can be found hidden inside 'housed'.
(Other definitions for ouse that I've seen before include "Norfolk river" , "River at Lewes (Sussex)" , "O, Sue, here is a river" , "Flowing water" , "River of 1 across" .)