People going into an assembly (6)

I believe the answer is:

nation

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'people going' is the definition.
'nation' can be an answer for 'people' (I've seen this before). I'm unsure of the 'going' bit.

'into an assembly' is the wordplay.
'assembly' indicates an anagram.
'into'+'an'='intoan'
'intoan' anagrammed gives 'NATION'.

Can you help me to learn more?

(Other definitions for nation that I've seen before include "Race" , "Large community of people under one government" , "Anoint (anag)" , "A federation of tribes, as Native Americans say" , "People of a state" .)

I've seen this clue in The Globe and Mail.

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