Crossword Genius

Hide excitement about ending of Grease (7)

Ross

I believe the answer is:

leather

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'hide' is the definition.
(an animal hide)

I cannot understand how the rest of the clue works.

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(Other definitions for leather that I've seen before include "Beat" , "Material made from animal skin" , "Treated hide" , "Polishing cloth" , "durable material" .)

I've seen this clue in The Guardian.
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