Crossword Genius

Investor’s displeasure with switch of sides (5)

Ross

I believe the answer is:

angel

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'investor's' is the definition.
(term for a financial backer of new businesses)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for angel that I've seen before include "Messenger of God" , "Heavenly body" , "Cloud resident?" , "somewhere on the Northern Line" , "Word linking cake and fish" .)

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