Excellent copper fired round fleeing yard (6)
I believe the answer is:
cushty
'excellent' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'copper fired round fleeing yard' is the wordplay.
I cannot quite 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 present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for cushty that I've seen before include "Iniquitous" , "brilliant in Peckham" .)