Crossword Genius

The ivories, as tickled (4)

Ross

I believe the answer is:

keys

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for keys that I've seen before include "Bunch of openers?" , "Low islands, sycamore fruits" , "Islands; piano parts" , "Lockers" , "'Unlockers'" .)

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