Crossword Genius

Go after toys, principally to play with (7)

Ross

I believe the answer is:

twiddle

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'play with' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for twiddle that I've seen before include "Jiggle" , "Twirl (thumbs?)" , "Finger idly" , "Play nervously (with something)" , "Turn in a purposeless way" .)

I've seen this clue in The Independent.
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