Whirlpool on top, only to replace Electrolux at the first position (6)

I believe the answer is:

vortex

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'whirlpool' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for vortex that I've seen before include "Whirling fluid" , "Revolutionary movement" , "Whirlpool or swirling mass" , "Whirlpool - whirlwind" , "Engulfing swirl of e.g. whirlpool" .)

I've seen this clue in The Hindu.

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