Erect Xi properly as auxiliary generator (7)

I believe the answer is:

exciter

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

'auxiliary generator' is the definition.
(I've seen this in another clue)

'erect xi properly' is the wordplay.
'erect xi' can be anagrammed to 'EXCITER'.
However, I'm not sure how the anagram is indicated.

'as' acts as a link.

Can you help me to learn more?

(Other definitions for exciter that I've seen before include "something thrilling" , "Sparking apparatus" .)

I've seen this clue in the Sydney Morning Herald.

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