They're heard to give a blockhead disturbed sleep (6)
I believe the answer is:
bleeps
'they're heard' is the definition.
The definition suggests an adverb but the answer is not.
'give a blockhead disturbed sleep' is the wordplay.
'give' means one lot of letters go next to another.
'a blockhead' becomes 'b' (head letter of 'block').
'disturbed' is an anagram indicator (the order of letters is disturbed).
'sleep' is an anagram of 'leeps'.
'b'+'leeps' is 'BLEEPS'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for bleeps that I've seen before include "Audible signals" , "Short high tones to send signals" , "censors bad language" , "High-pitched signals" .)