To migraine sufferer it's akin to expatriation (10)

I believe the answer is:

emigration

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

'expatriation' is the definition.
(I know that expatriation can be written as emigration)

'to migraine sufferer it's akin' is the wordplay.
'to migraine' anagrams to 'EMIGRATION'.
But, I am not sure how the anagram is indicated.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for emigration that I've seen before include "Act of leaving one's own country for good" , "Departure from country" , "Imagine rot (anag.)" .)

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

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