Crossword Genius

General store's opening north of Munster (7)

Ross

I believe the answer is:

sherman

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'general' is the definition.
(I know that Sherman is an general)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sherman that I've seen before include "US general, marched through Georgia" , "William -, US Civil War general (Atlanta)" .)

I've seen this clue in The Independent.
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