Faulty connection, but not for long (5)
I believe the answer is:
short
'faulty' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for short that I've seen before include "Curt" , "Limited in duration" , "Neat" , "Terse; in insufficient supply" , "Concise" .)