Dope touring large Scottish valley (4)
I believe the answer is:
glen
'scottish valley' is the definition.
(I've seen this before)
'dope touring large' is the wordplay.
'dope' becomes 'gen' (both can mean information).
'touring' indicates putting letters inside (touring can mean going round).
'large' becomes 'L' (eg in clothes sizes).
'gen' placed around 'l' is 'GLEN'.
(Other definitions for glen that I've seen before include "Depression in Scotland" , "Narrow, deep mountain valley" , "Scottish or Irish valley" , "Valley, dale" , "Long narrow valley in Scotland" .)