Left info round Scots valley (4)
I believe the answer is:
glen
'scots valley' is the definition.
(I've seen this before)
'left info round' is the wordplay.
'left' becomes 'L' (common abbreviation).
'info' becomes 'gen' (informal term for information).
'round' means one lot of letters goes inside another.
'l' put inside 'gen' is 'GLEN'.
(Other definitions for glen that I've seen before include "Campbell perhaps" , "Valley, dale" , "Highland valley" , "Narrow Scots valley" , "Depression in Scotland" .)