Em or Bee, e.g (4)

I believe the answer is:

aunt

(Other definitions for aunt that I've seen before include "Uncle's wife" , "Family relative" , "Parent's sister" , "Tuna (anag.)" , "Charley's ___ , farce staged in London in 1892, revived and adapted ever since" .)

I've seen this clue in The New York Times.

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