Crossword Genius

Perhaps Chad irons (perhaps) in leisure centres (7,5)

Ross

I believe the answer is:

surface water

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'perhaps chad' is the definition.
(I know that Lake Chad is a endorheic lake)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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