Engine part, the cracking choice of some Lilliputians (3,3)

I believe the answer is:

big end

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

I cannot understand how the rest of the clue works.

(Other definitions for big end that I've seen before include "Dramatic finale" , "Piece of engine" , "essential to Chitty Chitty Bang Bang?" , "Part of the connecting rod in a piston engine" , "favoured by Lilliputian rebels" .)

I've seen this clue in The Times.

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