Audible prompt to give line (5)
I believe the answer is:
queue
'line' is the definition.
(I know that queue is a type of line)
'audible prompt' is the wordplay.
'audible' shows a homophone (sound like).
'prompt' becomes 'cue' (cue can mean a prompt or signal).
'cue' is a homophone of 'QUEUE'.
'to give' is the link.
(Other definitions for queue that I've seen before include "Buyers' line" , "Line of people waiting for something" , "orderly people?" , "Waiting list" , "Form a line" .)