Initially minimum stress, as leaving US city (7)

I believe the answer is:

memphis

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'us city' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for memphis that I've seen before include "Ancient Egyptian city" , "US city where Gracelands is located" , "Largest city in Tennessee" , "City of Tennessee/Egypt" , "Name of city at different times overlooking the Nile and Mississippi?" .)

I've seen this clue in The Telegraph.

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