Crossword Genius

Box of vital parts? (5)

Ross

I believe the answer is:

trunk

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'box' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for trunk that I've seen before include "Baggage item" , "Main stem of tree" , "Elephant's nose" , "Large luggage case" , "Part of a tree - part of an elephant" .)

I've seen this clue in the Evening Standard.
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