Crossword Genius

Aquatic activity (5)

Ross

I believe the answer is:

scuba

(Other definitions for scuba that I've seen before include "Skin-diving apparatus" , "Aqualung" , "Apparatus for divers" , "Skin-diver's device" , "Device that lets divers breathe under water" .)

I've seen this clue in The Wall Street Journal.
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