Crossword Genius

Whirling motion of Merckx maybe (4)

Ross

I believe the answer is:

eddy

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'whirling motion' is the definition.
(type of whirlpool)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for eddy that I've seen before include "Water circulating" , "Turner at sea" , "Small circular movement of water" , "Circular movement of air" , "Little swirl in water" .)

I've seen this clue in The Telegraph.
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