One working with Norma on hill? (8)

I believe the answer is:

operator

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Here is my best explanation:

'one working' is the definition.

'norma on hill?' is the subsidiary indication.

'norma' becomes 'opera' (norma is an opera by vincenzo bellini).

'on' is a charade indicator (letters next to each other).

'hill?' becomes 'tor' (tor is a kind of hill).

'opera'+'tor'='operator'

'with' is the link.

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(Other definitions for operator that I've seen before include "Poor rate for a businessman", "Telephone controller", "Person who runs a machine or a business", "Switchboard worker", "Manipulator", "Switchboard employee", "Agent that runs some apparatus or machine", "agent", "Person working a switchboard" and "(Machine) user".)

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