Crossword Genius

Wartime machine with some variations? (6)

Ross

I believe the answer is:

enigma

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'wartime' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'machine with some variations?' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

Can you help me to learn more?

(Other definitions for enigma that I've seen before include "Gamine being a bit of a puzzle" , "Coding device" , "There's a mystery in game" , "Mystery U puzzle" , "Mysteriously puzzling person or thing" .)

I've seen this clue in The Times.
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