Wash ferret, possibly, in this? (5,5)

I believe the answer is:

fresh water

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

'wash ferret possibly' is the wordplay.
'possibly' indicates an anagram.
'wash'+'ferret'='washferret'
'washferret' is an anagram of 'FRESH-WATER'.

'in' is the link.

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