Discreetly get shot of Asian food smell in burial chamber (9)

'discreetly get shot' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'asian food smell in burial chamber' is the wordplay.
'asian food' becomes 'pho' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'smell' becomes 'B.O.' (abbreviation for Body Odour).
'in' is an insertion indicator.
'burial chamber' becomes 'tomb' (I've seen this before).
'bo' going inside 'tomb' is 'tobomb'.
'pho'+'tobomb'='PHOTOBOMB'

'of' acts as a link.

Can you help me to learn more?