Wanting Queen at aid broadcast (10)
I believe the answer is:
inadequate
'wanting' is the definition.
(similar in meaning)
'queen at aid broadcast' is the wordplay.
'broadcast' is an anagram indicator (letters scattered or cast around).
'queen'+'at'+'aid'='queenataid'
'queenataid' with letters rearranged gives 'INADEQUATE'.
(Other definitions for inadequate that I've seen before include "lacking" , "Found wanting" , "Short of what is required" , "Deficient" , "not up to the job" .)