Hide excitement about ending of Grease (7)
I believe the answer is:
leather
'hide' is the definition.
(an animal hide)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for leather that I've seen before include "Beat" , "Material made from animal skin" , "Treated hide" , "Polishing cloth" , "durable material" .)