No end to enemy activity, start 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'm not certain of the 'evacuation' bit.

'no end to enemy activity start' is the wordplay.
'no end to' means to remove the last letter.
'start' suggests taking the first letters.
The first letter of 'activity' is 'a'.
'enemy' with its last letter removed is 'enem'.
'enem'+'a'='ENEMA'

Can you help me to learn more?

(Other definitions for enema that I've seen before include "Rectal medicine" , "Bowel evacuator" , "fundamental procedure?" , "Liquid injection given as a laxative" , "The bottom line in medical treatment?" .)

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

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