Crossword Genius

Work of a doctor with officer before rehearsal (7,8)

Ross

I believe the answer is:

general practice

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'work of a doctor' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'officer before rehearsal' is the wordplay.
'officer' becomes 'general' (general officer is a kind of officer).
'before' means one lot of letters go next to another.
'rehearsal' becomes 'practice' (I've seen this before).
'general'+'practice'='GENERAL PRACTICE'

'with' acts as a link.

Can you help me to learn more?

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

I've seen this clue in The Daily Express.
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