Capone's behind collection of songs (5)
I believe the answer is:
album
'collection of songs' is the definition.
(I've seen this in another clue)
'capone's behind' is the wordplay.
'capone' becomes 'Al' (gangster Al Capone).
'behind' becomes 'bum' (synonyms).
'al'+'bum'='ALBUM'
(Other definitions for album that I've seen before include "Vinyl collectible" , "Blank book for keeping stamps, photographs etc" , "Book for organising photographs" , "Collection of photographs" , "Long-playing record" .)