Share a bronze medal (5)
I believe the answer is:
third
This clue is a double definition.
'share' is the first definition.
(a third is a share or fraction)
'a bronze medal' is the second definition.
(bronze medals are awarded for third place)
(Other definitions for third that I've seen before include "Winning bronze medal" , "Bronze medal place" , "Eroica, Beethoven's - symphony" , "One of three equal parts" , "Less than half, rather" .)