A hole in ten unusually high (7)

I believe the answer is:

eminent

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'high' is the definition.
(I know that high can be written as eminent)

'a hole in ten unusually' is the wordplay.
'a hole in' becomes 'emin' (I can't explain this - if you can you should give a lot more credence to this answer).
'unusually' is an anagram indicator.
'ten' with letters rearranged gives 'ent'.
'emin'+'ent'='EMINENT'

Can you help me to learn more?

(Other definitions for eminent that I've seen before include "Important" , "Met nine who were distinguished" , "Illustrious like cardinal?" , "Noted" , "Famous and respected" .)

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

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