Introduction to Götterdämmerung that surprises me! (3)

I believe the answer is:

gee

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'surprises me' is the definition.
The definition suggests a singular noun which matches the answer.

'introduction to gotterdammerung that' is the wordplay.
'introduction to' says to take the initial letters.
'that' becomes 'ee' (I am not sure about this - if you are sure you should believe this answer much more).
The initial letter of 'gotterdammerung' is 'g'.
'g'+'ee'='GEE'

Can you help me to learn more?

(Other definitions for gee that I've seen before include "Goodness" , "Exclamation of surprise" , "Well I never" , "that's something" , "crumbs" .)

I've seen this clue in The Times.

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