Crossword Genius

Wilberforce achieved this changing oil in boat (9)

Ross

I believe the answer is:

abolition

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'wilberforce achieved this' is the definition.
The definition suggests a singular noun which matches the answer.

'changing oil in boat' is the wordplay.
'changing' indicates anagramming the letters.
'oil'+'in'+'boat'='oilinboat'
'oilinboat' with letters rearranged gives 'ABOLITION'.

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(Other definitions for abolition that I've seen before include "Eradication" , "Action of doing away with something" , "Act of putting an end to something" , "Annulment" , "Wilberforce achieved it" .)

I've seen this clue in The Sun.
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