Crossword Genius

Main tax office alliance (5)

Ross

I believe the answer is:

seato

I'm a little stuck... Click here to teach me more about this clue!

'alliance' is the definition.
(I've seen this in another clue)

'main tax office' is the wordplay.
'main' becomes 'sea' (the main is an old name for the sea).
'tax office' becomes 'to' (this could be a standard abbreviation which I don't know about).
'sea'+'to'='SEATO'

Can you help me to learn more?

(Another definition for seato that I've seen is " former defence alliance".)

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