Announcement about overweight actors (9)

I believe the answer is:

broadcast

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'announcement' is the definition.
(thesaurus)

'overweight actors' is the wordplay.
'overweight' becomes 'broad' (I can't justify this - if you can you should give a lot more credence to this answer).
'actors' becomes 'cast' (group of actors).
'broad'+'cast'='BROADCAST'

'about' is the link.

Can you help me to learn more?

(Other definitions for broadcast that I've seen before include "Sow" , "Show" , "Transmit by radio or television" , "Send out over the airwaves" , "Transmit by radio/TV" .)

I've seen this clue in the Sydney Morning Herald.

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