Road encompassing most of journey, showing you where to go (7)
I believe the answer is:
latrine
'you where to go' is the definition.
I can't judge whether this definition defines the answer.
'road encompassing most of journey' is the wordplay.
'road' becomes 'lane' (I have seen 'Small road' mean 'lane' so perhaps 'road' could also mean 'lane').
'encompassing' is an insertion indicator.
'most of' means to remove the last letter.
'journey' becomes 'trip' (trip is a kind of journey).
'trip' with its final letter removed is 'tri'.
'lane' going around 'tri' is 'LATRINE'.
'showing' acts as a link.
Can you help me to learn more?
(Other definitions for latrine that I've seen before include "A military lavatory" , "Reliant on military loo" , "Army lavatory" , "Camp lavatory" , "waste disposal unit" .)