Furniture placed by river (7)
I believe the answer is:
settees
'furniture' is the definition.
(I've seen this before)
'placed by river' is the wordplay.
'placed' becomes 'set' (synonyms).
'by' is a charade indicator (letters next to each other).
'river' becomes 'tees' (River Tees).
'set'+'tees'='SETTEES'
(Other definitions for settees that I've seen before include "furniture" , "Long indoor seats" , "Sofas" .)