Crossword Genius

Peak of affair -- one might blow it (10)

Ross

I believe the answer is:

matterhorn

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

'peak' is the definition.
(Matterhorn is an example)

'affair one might blow it' is the wordplay.
I cannot really see how this works, but
'affair' could be 'matter' ('matter' can be a synonym of 'affair') and 'matter' is present in the answer.
The remaining letters 'horn' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'of' is the link.

Can you help me to learn more?

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

I've seen this clue in The Telegraph.
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