Crossword Genius

Perhaps switches middle-sized sheets around (6)

Ross

I believe the answer is:

zapper

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If this is the answer, I'm afraid I cannot explain it.

Can you help me to learn more?

(Other definitions for zapper that I've seen before include "Remote control (slang)" , "pest control device" , "Channel flicker" , "TV remote-control" , "sort of control" .)

I've seen this clue in The Irish Times.
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