Short concerts (5)
I believe the answer is:
proms
'short concerts' is the definition.
(abbreviation for promenade concerts; 'short' indicates an abbreviation)
This is all the clue.
(Other definitions for proms that I've seen before include "London concerts" , "World's largest classical music festival, held annually (inf)" , "Classical music performances, in short, some of the audience stand" , "Henry Wood concerts" , "Sir Henry Wood's creation" .)