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Eye piece from virtual assistant swivelling around (4)

Ross

I believe the answer is:

iris

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'eye piece' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for iris that I've seen before include "Circular coloured membrane in the eye" , "Flag - surrounding pupil" , "Flag or flower in the eye" , "Woman" , "--- Murdoch, author" .)

I've seen this clue in The Times.
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