Crossword Genius

Officer with dummy-run at job for doctor (7,8)

Ross

I believe the answer is:

general practice

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'job for doctor' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'officer with dummy-run' is the wordplay.
'officer' becomes 'general' (general officer is a kind of officer).
'with dummy run' becomes 'practice' (I can't justify this - if you can you should give a lot more credence to this answer).
'general'+'practice'='GENERAL PRACTICE'

'at' is the link.

Can you help me to learn more?

(Other definitions for general practice that I've seen before include "convention?" , "Where you find doctors" , "should get lots of people fit" , "Treating business" , "Work of a local doctor" .)

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