Crossword Genius

Loathing calluses when cycling (5)

Ross

I believe the answer is:

scorn

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'loathing' is the definition.
The answer and definition can be both feelings as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for scorn that I've seen before include "Open disrespect" , "Disdain or derision" , "Slight" , "Mocking contempt" , "Open contempt, disdain" .)

I've seen this clue in The Telegraph.
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