Soldiers retreating during each evacuation procedure (5)

I believe the answer is:

enema

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'evacuation procedure' is the definition.
'enema' can be an answer for 'procedure' (I have seen 'medical procedure' mean 'enema' so perhaps 'procedure' could also mean 'enema'). I am not sure about the 'evacuation' bit.

'soldiers retreating during each' is the wordplay.
'soldiers' becomes 'men' (men can mean a group of soldiers).
'retreating' says the letters should be written in reverse.
'during' indicates putting letters inside.
'each' becomes 'ea' (abbreviation).
'men' in reverse letter order is 'nem'.
'nem' inserted inside 'ea' is 'ENEMA'.

Can you help me to learn more?

(Other definitions for enema that I've seen before include "medicine to get you going" , "treatment by rear entrance" , "Medication introduced from behind" , "fundamental procedure?" , "Colonic irrigation" .)

I've seen this clue in The Telegraph.

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