International holding of billionaire (4)

I believe the answer is:

lion

'international' is the definition.
(international rugby player for Britain)

'holding of billionaire' is the wordplay.
'holding' indicates a hidden word.
'LION' is hidden within 'of billionaire'.

(Other definitions for lion that I've seen before include "Leo" , "Cowardly visitor in Oz" , "Courageous person" , "Sought after celebrity (showing great strength and courage?)" , "Carnivorous 6" .)

I've seen this clue in The Guardian.

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