Hotel surrounded by Scottish river thicket (7)
I believe the answer is:
spinney
'thicket' is the definition.
(I know that spinney is a type of thicket)
'hotel surrounded by scottish river' is the wordplay.
'hotel' becomes 'inn' (inn is a kind of hotel).
'surrounded by' is an insertion indicator.
'scottish river' becomes 'spey' (I've seen this before).
'inn' placed inside 'spey' is 'SPINNEY'.
(Other definitions for spinney that I've seen before include "Small wood with undergrowth" , "Small clump of trees" , "Cops, we hear" , "little wood" , "Copse of trees" .)