Calm about regular knife used in operating medical transport (9)
I believe the answer is:
ambulance
'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" .)