Wow guru after elevating foot (3,4)

I believe the answer is:

gee whiz

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

'wow' is the definition.
(I know that wow can be written as gee whiz)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for gee whiz that I've seen before include "Exclamation of surprise (mainly US)" , "Expression of admiration" , "may accompany a gasp?" , "Interjection of surprise" , "Amazing" .)

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

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