Crossword Genius

Cave reached when going over river (6)

Ross

I believe the answer is:

grotto

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'cave' is the definition.
(I know that grotto is a type of cave)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for grotto that I've seen before include "(Imitation) cave" , "A picturesque cave as in Lourdes (6)" , "Cavern" , "Fancy cave" , "Artificially or naturally ornamented cave" .)

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