Satellite rattles around (7)
I believe the answer is:
telstar
'satellite' is the definition.
(US satellite programme)
'rattles around' is the wordplay.
'around' indicates anagramming the letters.
'rattles' anagrammed gives 'TELSTAR'.
(Other definitions for telstar that I've seen before include "Communications satellite" , "Communication satellite" , "Old satellite" , "Distant transmitter" , "Early sixties satellite" .)