Crossword Genius

Piece of music at service primarily for common people (4-4)

Ross

I believe the answer is:

riff-raff

'common people' is the definition.
(informal term for a common people)

'piece of music at service primarily for' is the wordplay.
'piece of music' becomes 'riff' (a repeated melody).
'at' is a charade indicator (letters next to each other).
'service' becomes 'raf' (Royal Air Force).
'primarily' says to take the initial letters.
The initial letter of 'for' is 'f'.
'riff'+'raf'+'f'='RIFF-RAFF'

(Other definitions for riff-raff that I've seen before include "Disreputable people" , "Dregs of society" , "Hoi polloi" , "rubbish" , "Undesirables" .)

I've seen this clue in The Guardian.
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