Outer part of a lemon (4)

I believe the answer is:

zest

(Other definitions for zest that I've seen before include "Enthusiastic enjoyment" , "Piquancy - fruit rind" , "Peel used as flavouring" , "Outer layer of citrus peel" , "Tang; gusto" .)

I've seen this clue in the USA Today and the Sydney Morning Herald.

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