Crossword Genius

Bad luck in Derby? (4,6)

Ross

I believe the answer is:

hard cheese

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

This clue might be a double definition.

'bad luck' is the first definition.
(I've seen this before)

'derby?' is the second definition.
Both the answer and definition are singular nouns.
Maybe you can see an association between them that I can't see?

'in' is the link.

Can you help me to learn more?

(Other definitions for hard cheese that I've seen before include "Bad luck! (Grate it!)" , "Leicester" , "mousetrap" , "commiserating words" , "Eighteen [EMMENTAL], for instance" .)

I've seen this clue in The Independent.
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