Crossword Genius

Day that's added to spring (4)

Ross

I believe the answer is:

leap

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'spring' is the definition.
(both can mean to jump)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for leap that I've seen before include "Jump a long way", "Basket", "vault", "Sudden surge", "Pounce".)

I've seen this clue in The Telegraph.
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