Band Aid record brought back tears when broadcast (7)
I believe the answer is:
plaster
'band aid' is the definition.
(thesaurus)
'record brought back tears when broadcast' is the wordplay.
'record' becomes 'lp' (abbreviation for long play record).
'brought back' shows that the letters should be reversed in order.
'when broadcast' is an anagram indicator (broadcast can mean disperse or spread).
'lp' backwards is 'pl'.
'tears' with letters rearranged gives 'aster'.
'pl'+'aster'='PLASTER'
(Other definitions for plaster that I've seen before include "cake" , "Small wound covering" , "Adhesive material" , "Stuff that sticks on ceilings or wounds" , "Cover for cut" .)