Greek hero soon captures spirited maiden (9)
I believe the answer is:
agamemnon
'greek hero' is the definition.
(I've seen this before)
'soon captures spirited maiden' is the wordplay.
'soon' becomes 'anon' (synonyms).
'captures' is an insertion indicator.
'spirited' becomes 'game' (synonyms).
'maiden' becomes 'm' (cricket abbreviation).
'game'+'m'='gamem'
'anon' going around 'gamem' is 'AGAMEMNON'.
(Other definitions for agamemnon that I've seen before include "Leader of Greeks against Troy" , "king of old" , "Gk. leader against Troy" , "Leader of Greeks in Trojan War" , "mythological king" .)