Acquit a drunk now living on water (7)

I believe the answer is:

aquatic

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'on water' is the definition.
(I know this)

'acquit a drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'acquit'+'a'='acquita'
'acquita' anagrammed gives 'AQUATIC'.

'now living' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for aquatic that I've seen before include "Living in or near water" , "Marine plant" , "Growing or found in water" , "20 [TERRAPIN] is" , "Relating to water" .)

I've seen this clue in The Globe and Mail.

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