UN chap in need of broadcasting corporation (6)

I believe the answer is:

paunch

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'corporation' is the definition.
(synonyms)

'un chap in need of broadcasting' is the wordplay.
'un chap' anagrams to 'PAUNCH'.
Though, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for paunch that I've seen before include "Pot" , "corporation" , "Beer belly" , "Protruding stomach" , "result of too much booze?" .)

I've seen this clue in The Times.

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