Crossword Genius

Halogens found in steep rock face (5)

Ross

I believe the answer is:

cliff

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

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

Can you help me to learn more?

(Other definitions for cliff that I've seen before include "-- Richard, singer" , "Steep high rockface" , "High, steep rock face" , "Precipice" , "A sheer rock face, in mountain or by sea" .)

I've seen this clue in The Independent.
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