Crossword Genius

Calm about regular knife used in operating medical transport (9)

Ross

I believe the answer is:

ambulance

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

'operating medical transport' is the definition.
'ambulance' can be an answer for 'transport' (ambulance is a kind of transport). I'm unsure of the 'operating medical' bit.

'calm about regular knife' is the wordplay.
'regular' indicates alternate letters.
'knife' becomes 'lance' (lance is a kind of knife).
'calm'+'about'='calmabout'
The alternating letters of 'calmabout' are 'ambu'.
'ambu'+'lance'='AMBULANCE'

'used in' acts as a link.

Can you help me to learn more?

(Other definitions for ambulance that I've seen before include "mobile medical unit" , "Vehicle for sick or injured" , "Emergency vehicle" , "Vehicle designed to carry the sick" , "Transport for the sick" .)

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