"Didn't Mummy ever tell you it was rude to ____, Potter?” (Harry Potter and the Half-Blood Prince) (9)

I believe the answer is:

eavesdrop

(Other definitions for eavesdrop that I've seen before include "Listen at windows" , "listen privately" , "Listen in, earwig" , "Listen secretly to others' conversations" , "Listen-in" .)

I've seen this clue in The Times.

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