The state a mine may be in (5)

I believe the answer is:

maine

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'the state' is the definition.
(US state)

'a mine may be in' is the wordplay.
'a mine' can be anagrammed to 'MAINE'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for maine that I've seen before include "New England state" , "NE US state" , "North-east American state" , "US state, capital Augusta (5)" , "N. US Atlantic state" .)

I've seen this clue in the Evening Standard.

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