Notices found in Scottish river area and lake (4,3)
I believe the answer is:
dead sea
'lake' is the definition.
(I know that Dead Sea is a lake)
'notices found in scottish river area' is the wordplay.
'notices' becomes 'ads' (advertisements).
'found in' is an insertion indicator.
'scottish river' becomes 'dee' (I've seen this in another clue).
'area' becomes 'a' (maths abbreviation).
'ads' inserted inside 'dee' is 'deadse'.
'deadse'+'a'='DEAD SEA'
'and' acts as a link.
(Other definitions for dead sea that I've seen before include "Sounds like a late ocean but it's a lake" , "Lake in Jordan valley where Scrolls were found" , "Lake of Jordan/Israel" , "Saltwater lake in the Jordan valley" , "The lake that's a late ocean" .)