Crossword Genius

Boo when lord ditches Penny for Juliet (4)

Ross

I believe the answer is:

jeer

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

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for jeer that I've seen before include "Catcall" , "Tease" , "Mock publicly" , "Boo" , "Barrack" .)

I've seen this clue in The Independent.
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