Vocal item from a boy at midnight (4)
I believe the answer is:
song
'vocal item' is the definition.
(I've seen this before)
'a boy at midnight' is the wordplay.
'a boy' becomes 'son' ('son' can be a synonym of 'boy').
'at' says to put letters next to each other.
'midnight' becomes 'g' (the middle letter in 'night').
'son'+'g'='SONG'
'from' acts as a link.
(Other definitions for song that I've seen before include "Piece of music, usually with words" , "Something recorded by 26 [FACES] , for example" , "See 17" , "Melody (which is cheap to go for)" , "Carol, for example" .)