Crossword Genius

It provides excitement say in spring (6)

Ross

I believe the answer is:

source

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'spring' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for source that I've seen before include "Beginning to add" , "Origin; spring" , "'Origin, root (6)'" , "Fountainhead - journalist's informant" , "From which something springs" .)

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