Position on a road out of type of bog (8)
I believe the answer is:
standard
'type of bog' is the definition.
'standard' can be an answer for 'type' (thesaurus). I am not sure about the 'of bog' bit.
'position on a road' is the subsidiary indication.
'position' becomes 'stand' (stand is a kind of position**).
'on' is a charade indicator (letters next to each other).
'road' becomes 'rd' (abbreviation).
'stand'+'a'+'rd'='standard'
'out of' is the link.
Can you help me to learn more?
(Other definitions for standard that I've seen before include "Flag - level of attainment" , "Jack" , "thing seen looking down The Mall?" , "Conventional" , "kind of lamp" .)