Crossword Genius

Substitute second one of three Shakespearean sisters (6)

Ross

I believe the answer is:

switch

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'substitute' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for switch that I've seen before include "On/off device" , "Change or exchange" , "Change course" , "Change round" , "that turns on the power" .)

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