Broadcast den's destruction (4)
I believe the answer is:
send
'broadcast' is the definition.
(I know that broadcast can be written as send)
'den's destruction' is the wordplay.
'destruction' indicates an anagram.
'dens' with letters rearranged gives 'SEND'.
(Other definitions for send that I've seen before include "Dispatch by post" , "and 2: Advise" , "Mail" , "Transmit (message)" , "broadcast" .)