Sentence about everything a booby may produce? (8)
I believe the answer is:
birdcall
'a booby may produce?' is the definition.
(booby is a type of bird)
'sentence about everything' is the wordplay.
'sentence' becomes 'bird' (slang term for a prison sentence).
'about' becomes 'c' (circa abbreviation).
'everything' becomes 'all' (I've seen this before).
'bird'+'c'+'all'='BIRDCALL'
(Other definitions for birdcall that I've seen before include "(Device to imitate) song of songster" , "(Instrument copying) songster's song" , "Sound of tweeters" .)