Crossword Genius

Not, in itself, the whole caboodle? (3)

Ross

I believe the answer is:

kit

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'not in' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for kit that I've seen before include "In strip" , "Necessary equipment" , "Specialised clothing or set of parts for assembly" , "Set of parts sold to be assembled" , "Equipment, clothing" .)

I've seen this clue in the Evening Standard.
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