Sad record playing, very slow (12)
I believe the answer is:
disconsolate
'sad' is the definition.
(I know that sad can be written as disconsolate)
'record playing very slow' is the wordplay.
'record' becomes 'disc' (eg a CD, compact disc).
'playing' becomes 'on' (on can mean playing or performing).
'very' becomes 'so' (both can mean 'extremely').
'slow' becomes 'late' (I've seen this in other clues).
'disc'+'on'+'so'+'late'='DISCONSOLATE'
(Other definitions for disconsolate that I've seen before include "Dejected" , "Stuck with the blues" , "Deeply sad" , "Unhappy and impossible to comfort" , "Melancholy" .)