Report of copper, perhaps a bit brave (10)
I believe the answer is:
mettlesome
'brave' is the definition.
(similar in meaning)
'report of copper perhaps a bit' is the wordplay.
'report of' indicates a 'sounds like' (homophone) clue.
'copper perhaps' becomes 'metal' (copper is a kind of metal).
'a bit' becomes 'some' (I've seen this in other clues).
'metal' sounds like 'mettle'.
'mettle'+'some'='METTLESOME'
(Other definitions for mettlesome that I've seen before include "High-spirited" , "Spirited, resilient" , "game" .)