Crossword Genius

Disappointed after Derby tip, perhaps (7,3)

Ross

I believe the answer is:

cheesed off

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

'disappointed' is the definition.

'derby tip perhaps' is the wordplay.
I cannot really understand how this works, but
'tip' could be 'doff' (I've seen this in another clue) and 'doff' is located in the answer.
The remaining letters 'cheese' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'after' is the link.

Can you help me to learn more?

(Other definitions for cheesed off that I've seen before include "frustrated" , "Cross" , "Not at all happy" , "Fed up, disgruntled" , "Bored" .)

I've seen this clue in The Telegraph.
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