Hygiene manual may contain way to eliminate waste (5)

I believe the answer is:

enema

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'way to eliminate waste' is the definition.
I can't judge whether this defines the answer.

'hygiene manual may contain' is the wordplay.
'contain' indicates the answer is hidden within the clue (words from the clue contain the answer).
'ENEMA' can be found hidden inside 'hygiene manual may'.

Can you help me to learn more?

(Other definitions for enema that I've seen before include "The bottom line in medical treatment?" , "Suppository" , "Stern action from nurse perhaps" , "In the end medical procedure" , "Medication introduced from behind" .)

I've seen this clue in The Irish Times.

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