US coach to scoff about rule (7)
I believe the answer is:
railcar
'us coach' is the definition.
'railcar' can be an answer for 'coach' (I've seen this before). I am unsure of the 'us' bit.
'scoff about rule' is the wordplay.
'scoff' becomes 'rail' (I've seen this before).
'about' becomes 'ca' (abbreviation for 'circa'**).
'rule' becomes 'r' (legal abbreviation).
'rail'+'ca'+'r'='RAILCAR'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for railcar that I've seen before include "Passenger vehicle" , "coach" , "Wagon on tracks" , "Powered train unit" , "Small train" .)