They cover hits by Underworld (10)

I believe the answer is:

lampshades

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'they' is the definition.
Both the answer and definition are plural nouns.
Perhaps you can see a link between them that I don't see?

'cover hits by underworld' is the wordplay.
'cover hits by' becomes 'lamps' (I am not sure about this - if you are sure you should believe this answer much more).
'underworld' becomes 'Hades' (Hades can mean the underworld in Greek myth).
'lamps'+'hades'='LAMPSHADES'

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I've seen this clue in The Independent.

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