Ms Lee, the tea lady (5)

I believe the answer is:

rosie

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

I can't explain the remainder of the clue.

(Other definitions for rosie that I've seen before include "literary drinking companion" , "Cider girl" , "Girl's name" , "lady" , "It could be tea" .)

I've seen this clue in the Evening Standard.

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