A set of cards four inches high (4)

I believe the answer is:

hand

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'a set of cards' is the definition.

I cannot understand how the rest of the clue works.

(Other definitions for hand that I've seen before include "Unit of equine measurement" , "See 12" , "Index" , "Given cards" , "Round of applause" .)

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

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