Greek character nothing short of brave and gallant (10)
I believe the answer is:
chivalrous
'gallant' is the definition.
(synonyms)
'greek character nothing short of brave' is the wordplay.
'greek character' becomes 'chi' (letter from the Greek alphabet).
'nothing' becomes 'o' (looks like zero - 0).
'short of' is a deletion indicator.
'brave' becomes 'valorous' (similar in meaning).
'valorous' with 'o' taken out is 'valrous'.
'chi'+'valrous'='CHIVALROUS'
'and' acts as a link.
(Other definitions for chivalrous that I've seen before include "Gentlemanly" , "Like a knight" , "Courteous and gallant" .)