Accident calling for hospital at the bus terminus (5)
I believe the answer is:
smash
'accident' is the definition.
(smash is a kind of accident)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for smash that I've seen before include "Shatter violently" , "Hard tennis shot" , "something very popular" , "very successful hit" , "Break suddenly into little pieces" .)