Place using Enigma regularly during war? (6)

I believe the answer is:

weimar

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'place' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

'enigma regularly during war?' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'during' indicates putting letters inside.
The alternate letters of 'enigma' are 'eim'.
'eim' inserted into 'war' is 'WEIMAR'.

'using' acts as a link.

Can you help me to learn more?

(Other definitions for weimar that I've seen before include "German town associated with Goethe, Liszt and Schiller" , "13 [THIRD REICH] 's predecessor" , "City of Germany" , "German city associated with Liszt and Goethe" , "German republic until 1933" .)

I've seen this clue in The Independent.

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