Crossword Genius

Fingers often crossed (7)

Ross

I believe the answer is:

indexes

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'fingers' is the definition.
(I know this)

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

Can you help me to learn more?

(Other definitions for indexes that I've seen before include "A-Z listings" , "Listings at rear of books" , "A-to-Z listings" .)

I've seen this clue in The Globe and Mail.
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