Gosh, which half of the horse is it? (3)

I believe the answer is:

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'gosh' is the definition.
(I've seen this before)

'half of the horse is it?' is the wordplay.
'half of' indicates taking half.
'the horse' becomes 'gg' (geegee or GG is a childish term for a horse).
'is it?' becomes 'ee' (I can't explain this - if you can you should believe this answer much more).
'gg' cut in half is 'g'.
'g'+'ee'='GEE'

'which' is the link.

Can you help me to learn more?

(Other definitions for gee that I've seen before include "crumbs" , "Gosh" , "Goodness" , "- - whiz! (US)" , "Well I never" .)

I've seen this clue in the Evening Standard.

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