Doctor joins in Afghan war (6)

I believe the answer is:

combat

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'war' is the definition.
(I've seen this before)

'doctor joins in afghan' is the wordplay.
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'joins' indicates putting letters inside.
'in afghan' becomes 'coat' (I can't explain this - if you can you should believe this answer much more).
'mb' inserted into 'coat' is 'COMBAT'.

Can you help me to learn more?

(Other definitions for combat that I've seen before include "type of jacket" , "Conflict" , "Military fighting" , "Oppose" , "Fight against; fighting" .)

I've seen this clue in The Hindu.

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