Crossword Genius

What elevates the way religious festival gets swapped around (8)

Ross

I believe the answer is:

overpass

'what elevates the way' is the definition.
(bridge elevating a road or way)

I don't understand how the remainder of the clue works.

(Other definitions for overpass that I've seen before include "High-level road" , "bridge" , "Flyover" , "high road" .)

I've seen this clue in The Times.
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