Where Dad can swim with ease? (4,3)

I believe the answer is:

dead sea

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'where dad can swim with ease?' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for dead sea that I've seen before include "Disappearing lake" , "Inland salt lake on Israel-Jordan border" , "Salt lake fed by the Jordan river" , "R. Jordan lake" , "Saltwater lake in the Jordan valley" .)

I've seen this clue in The Times.

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