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Where a new qualified proctologist might expect to start (2,3,6)

Ross

I believe the answer is:

at the bottom

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

'where a new qualified proctologist might expect' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'to start' is the wordplay.
I cannot really understand how this works, but
'to' is within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Irish Times.
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