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Lambasts those holding business qualification (3)

Ross

I believe the answer is:

mba

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'business qualification' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'lambasts those holding' is the wordplay.
'holding' says the answer is hidden in the clue.
'MBA' is hidden within 'lambasts those'.

Can you help me to learn more?

(Another definition for mba that I've seen is " Higher business degree".)

I've seen this clue in The Irish Times.
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