Impressive broadcast organised (9)
I believe the answer is:
grandiose
'impressive' is the definition.
(similar in meaning)
'broadcast organised' is the wordplay.
'broadcast' indicates anagramming the letters.
'organised' with letters rearranged gives 'GRANDIOSE'.
(Other definitions for grandiose that I've seen before include "Pretentiously imposing -- organised (anag)" , "Impressive in style" , "Ambitious" , "Pretentiously impressive" , "Ridiculously impressive or imposing" .)