1984 comedy in which Daryl Hannah plays a mermaid (6)

I believe the answer is:

splash

(Other definitions for splash that I've seen before include "Watery sound" , "Cause water to fly about in drops" , "Effect of body falling on water" , "major news item" , "Big media display -- bellyflop effect" .)

I've seen this clue in The New York Times.

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