Crossword Genius

See something held in palm (4)

Ross

I believe the answer is:

date

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'palm' is the definition.
(date palm is a kind of palm)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for date that I've seen before include "Estimate age of" , "Romantic appointment" , "sell-by, for example" , "Appointment - fruit of palm" , "Fruit with stone" .)

I've seen this clue in The Sunday Times.
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