Much water used in inane coda (6,5)

I believe the answer is:

indian ocean

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'much water' is the definition.
'Indian Ocean' can be an answer for 'water' (Indian Ocean is an example). I'm unsure of the 'much' bit.

'used in inane coda' is the wordplay.
'used' indicates anagramming the letters.
'in'+'inane'+'coda'='ininanecoda'
'ininanecoda' anagrammed gives 'INDIAN OCEAN'.

Can you help me to learn more?

(Other definitions for indian ocean that I've seen before include "large expanse of sea" , "Expanse of sea east of Africa" , "Lots of water" , "Aggressively masculine" , "Waters between Africa and Australia" .)

I've seen this clue in The Mirror.

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