Go to get the original for principal (10)

I believe the answer is:

headmaster

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'for principal' is the definition.
(headmaster is a kind of principal)

'go to get the original' is the wordplay.
'go' becomes 'head' (I've seen this in another clue).
'to get the original' becomes 'master' (I can't explain this - if you can you should give a lot more credence to this answer).
'head'+'master'='HEADMASTER'

Can you help me to learn more?

(Other definitions for headmaster that I've seen before include "Top (male) teacher" , "Principal" , "School manager" .)

I've seen this clue in The Irish Times.

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