Ground (nr Saigon) masqueraded as a major venue (7,6,6)

I believe the answer is:

madison square garden

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'ground nr saigon masqueraded as a major venue' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'ground nr saigon masqueraded' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'nr'+'saigon'+'masqueraded'='nrsaigonmasqueraded'
'nrsaigonmasqueraded' is an anagram of 'MADISON SQUARE GARDEN'.

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I've seen this clue in The Guardian.

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