Underpass

2 clues
Subway
Highway feature
Similar answers:
Abounded
Airpassage
Allrounder
Allunderoneroof
Anunderstanding
Arundel
Asiunderstandit
Astounded
Asunder
Beringundercontrol
Bloodandthunder
Bluethunder
Blunder
Blunderbore
Blunderbus
Blunderbuss
Blunderbusses
Blundered
Blunderer
Blundergarments