The following are place names in Great Britain:- 3 Sounds like a very old Ausralian sports car, or a hill written about by Hans Christian Andersen. (6) 5 Dartmoor bridges receive applause. (8) 21 Pam Shriver's husband and a bond between them. (7) 23 Stop the invention, in 1878, by Joseph Hudson of Birmingham. (11)
Dartmoor has fine examples of Clapper bridges (a type of ancient design) so I suspect the answer is CLAPPERS rather than the name of any particular example