Removal of water ruins gardenia (8)

I believe the answer is:

drainage

'removal of water' is the definition.
(I've seen this before)

'ruins gardenia' is the wordplay.
'ruins' is an anagram indicator.
'gardenia' is an anagram of 'DRAINAGE'.

(Other definitions for drainage that I've seen before include "System of waste channels" , "Means of removing water" , "Facility for water removal" , "System for removing liquid" , "Removal of unwanted liquid" .)

I've seen this clue in The Sun.

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