Excellent copper fired round fleeing yard (6)
I believe the answer is:
cushty
'excellent' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'copper fired round fleeing yard' is the wordplay.
I cannot really see how this works, but
'copper' could be 'cu' (Cu is the chemical symbol for copper) and 'cu' is located in the answer.
'yard' could be 'y' (abbreviation) and 'y' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cushty that I've seen before include "Iniquitous" , "brilliant in Peckham" .)