Crossword Genius

Peak stuff, something that sounds a warning (10)

Ross

I believe the answer is:

matterhorn

'peak' is the definition.
(Matterhorn is a mountain)

'stuff something that sounds a warning' is the wordplay.
'stuff' becomes 'matter' (I've seen this in another clue).
'something that sounds a warning' becomes 'horn' (as in a car horn).
'matter'+'horn'='MATTERHORN'

(Other definitions for matterhorn that I've seen before include "Mountain in the Alps" , "A scale that may be difficult" , "one of a range" , "peak" , "Alpine mountain" .)

I've seen this clue in The Times.
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