Receivers cunningly copied store sale (5,10)

I believe the answer is:

radio telescopes

'receivers' is the definition.
(radio telescopes receive radio signals)

'cunningly copied store sale' is the wordplay.
'cunningly' indicates anagramming the letters (a cunning or tricky form of the letters).
'copied'+'store'+'sale'='copiedstoresale'
'copiedstoresale' is an anagram of 'RADIO TELESCOPES'.

I've seen this clue in The Guardian.

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