Left dope going round Scots valley (4)
I believe the answer is:
glen
'scots valley' is the definition.
(I've seen this before)
'left dope going round' is the wordplay.
'left' becomes 'L' (common abbreviation).
'dope' becomes 'gen' (both can mean information).
'going round' is an insertion indicator (some letters go around others).
'l' inserted into 'gen' is 'GLEN'.
(Other definitions for glen that I've seen before include "Depression in Scotland" , "Narrow secluded valley in mountains" , "Narrow valley with a stream" , "Narrow Scots valley" , "Scottish or Irish valley" .)