Meeting team at last after my opus is broadcast (9)
I believe the answer is:
symposium
'meeting' is the definition.
(symposium is a kind of meeting)
'team at last after my opus is broadcast' is the wordplay.
'at last' suggests the final letters.
'after' means one lot of letters go next to another.
'broadcast' is an anagram indicator.
The last letter of 'team' is 'm'.
'my'+'opus'+'is'='myopusis'
'myopusis' with letters rearranged gives 'symposiu'.
'm' after 'symposiu' is 'SYMPOSIUM'.
(Other definitions for symposium that I've seen before include "Meeting or conference for discussion of a topic" , "Specialist conference" , "mass meeting" , "Conference on academic topic" , "Conference for the public discussion of a topic" .)