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Addressing persistent problem with temperance, drained drink again (9)

Ross

I believe the answer is:

rehydrate

I'm a little stuck... Click here to teach me more about this clue!

'addressing persistent problem with temperance drained drink' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'again' is the wordplay.
I cannot really see how this works, but
'again' could be 're' (prefix meaning 'again') and 're' is found in the answer.
The remaining letters 'hydrate' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for rehydrate that I've seen is " Add water to (a dried substance)".)

I've seen this clue in The Times.
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