Awful dusty mess on electronic equipment? (5,6)

I believe the answer is:

sound system

'electronic equipment?' is the definition.
(sound system is a kind of electronic equipment)

'awful dusty mess on' is the wordplay.
'awful' indicates anagramming the letters.
'dusty'+'mess'+'on'='dustymesson'
'dustymesson' is an anagram of 'SOUND SYSTEM'.

(Another definition for sound system that I've seen is " Hi-fi, for instance".)

I've seen this clue in The Telegraph.

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