Precipitous, sheer (5)

I believe the answer is:

steep

I believe this is a double definition.

'precipitous' is the first definition.
(synonyms)

'sheer' is the second definition.
(similar in meaning)

(Other definitions for steep that I've seen before include "Having a sharp incline" , "Quickly rising" , "Rising sharply" , "Precipitous - outrageous" , "Saturate; precipitous" .)

I've seen this clue in The Mirror.

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