Perhaps add water to ferns here, wilting (9)

I believe the answer is:

refreshen

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'perhaps add water to' is the definition.
(adding water might refresh something)

'ferns here wilting' is the wordplay.
'ferns here' can be anagrammed to 'REFRESHEN'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Independent.

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