General's quick to reject outsiders (3)

I believe the answer is:

lee

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'general's' is the definition.
(Robert E. Lee - US revolutionary commander)

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

Can you help me to learn more?

(Other definitions for lee that I've seen before include "actor" , "Robert E. - - , US hero" , "Protection" , "The sheltered side - of Cork's river?" , "Sheltered from the wind in Cork, perhaps" .)

I've seen this clue in The Independent.

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