Disappointed after Derby tip, perhaps (7,3)
I believe the answer is:
cheesed off
'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" .)