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UN row got hostile and got too big (8)

Ross

I believe the answer is:

outgrown

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'big' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives occasionally mean the same thing.

'un row got hostile and got too' is the wordplay.
'un row got' can be anagrammed to 'OUTGROWN'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Another definition for outgrown that I've seen is " Too big or mature for".)

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