Tracks almost completely dreadful (5)
I believe the answer is:
album
'tracks' is the definition.
(an album of songs or tracks)
'almost completely dreadful' is the wordplay.
'almost completely' becomes 'al' (I've seen this in other clues).
'dreadful' becomes 'bum' (bum can mean of bad quality).
'al'+'bum'='ALBUM'
(Other definitions for album that I've seen before include "Recording; book" , "LP, perhaps?" , "CD, say" , "Book for organising photographs" , "Old LP - book of photos" .)