Not a specific rank? (7)

I believe the answer is:

general

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'rank?' is the definition.
(I know that general officer is an Military rank)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for general that I've seen before include "Not specialised, rank" , "Enlarge for senior army officer" , "Lee perhaps" , "Common - soldier" , "Enlarge (anag.)" .)

I've seen this clue in the Evening Standard.

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