Prompts with the lines audibly (4)
I believe the answer is:
cues
'prompts' is the definition.
('cue' can be a synonym of 'prompt')
'the lines audibly' is the wordplay.
'the lines' becomes 'queues' (queue is a kind of line).
'audibly' shows a homophone (sound like).
'queues' is a homophone of 'CUES'.
'with' acts as a link.
(Other definitions for cues that I've seen before include "Signals for action" , "Actor's signal" , "Prompts for action" , "Snooker ball strikers" , "Snooker rods" .)