One runs through big road turning, with light run (7)
I believe the answer is:
impaler
'one runs through big' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'road turning with light run' is the wordplay.
'road' becomes 'MI' (resembles Mp motorway).
'turning' says the letters should be written backwards.
'with' is a charade indicator (letters next to each other).
'light' becomes 'pale' (similar in meaning).
'run' becomes 'r' (cricket abbreviation).
'mi' back-to-front is 'im'.
'im'+'pale'+'r'='IMPALER'
Can you help me to learn more?
(Another definition for impaler that I've seen is " murderous stakeholder".)