Early start means changing bottom clearers (6)

I believe the answer is:

enemas

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'bottom clearers' is the definition.
I can't tell whether this defines the answer.

'early start means changing' is the wordplay.
'start' suggests taking the first letters.
'changing' indicates anagramming the letters.
The initial letter of 'early' is 'e'.
'means' is an anagram of 'nemas'.
'e'+'nemas'='ENEMAS'

Can you help me to learn more?

(Other definitions for enemas that I've seen before include "See man (anag) - medical procedures" , "Bowel evacuation producers" .)

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

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