Crossword Genius

Came a cropper on rocky hill (4)

Ross

I believe the answer is:

fell

I'm a little stuck... Click here to teach me more about this clue!

'hill' is the definition.
(I know that fell is a type of hill)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for fell that I've seen before include "Knock down - mountain" , "Flatten" , "Cut down; hill" , "Lethal" , "Abated" .)

I've seen this clue in The Irish Independent.
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