University broadcast silent instrument (7)
I believe the answer is:
utensil
'instrument' is the definition.
(I've seen this in another clue)
'university broadcast silent' is the wordplay.
'university' becomes 'u' (abbreviation as in UMass).
'broadcast' indicates an anagram (letters scattered or cast around).
'silent' is an anagram of 'tensil'.
'u'+'tensil'='UTENSIL'
(Other definitions for utensil that I've seen before include "Gadget" , "one's employed in the kitchen" , "A container for kitchen use" , "vessel" , "Useful tool" .)