Champion's round, giving support to that woman (4)
I believe the answer is:
hero
'champion's' is the definition.
(synonyms)
'round giving support to that woman' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'giving support to' says to put letters next to each other.
'that woman' becomes 'her' (her refers to a woman).
'o' after 'her' is 'HERO'.
(Other definitions for hero that I've seen before include "paragon" , "Chief male character in story or film - probably very brave" , "Exceptionally brave person" , "lover whose lamp went out tragically" , "Leander's lover - a person of courage" .)