Greatness found in some military NCOs (9)

I believe the answer is:

sergeants

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

'in some military ncos' is the definition.
I can't judge whether this defines the answer.

'greatness' is the wordplay.
'greatness' anagrams to 'SERGEANTS'.
But, I'm not sure how the anagram is indicated.

'found' acts as a link.

Can you help me to learn more?

(Other definitions for sergeants that I've seen before include "Odd greatness of these army and police ranks" , "Greatness observed in NCOs" , "Greatness among NCOs" .)

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

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