Crossword Genius

Sharpness put wife off piece of cheddar (4)

Ross

I believe the answer is:

edge

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

'sharpness' is the definition.
(I know that sharpness can be written as edge)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for edge that I've seen before include "Guitarist with U2" , "Advantage (informal)" , "Create borders" , "Force" , "Hem" .)

I've seen this clue in The Independent.
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