Audible signals by side of bed disturbed sleep (6)
I believe the answer is:
bleeps
'audible signals' is the definition.
(I've seen this before)
'side of bed disturbed sleep' is the wordplay.
'side of' indicates taking the first letters (the letter from one side of the word).
'disturbed' is an anagram indicator (the order of letters is disturbed).
The initial letter of 'bed' is 'b'.
'sleep' is an anagram of 'leeps'.
'b'+'leeps'='BLEEPS'
'by' is the link.
(Other definitions for bleeps that I've seen before include "censors bad language" , "High-pitched signals" , "Audible signals" , "Short high tones to send signals" .)