He/she/it/they was a bronze medallist (5,6)
I believe the answer is:
third person
'hesheitthey' is the definition.
I can't judge whether this definition defines the answer.
'a bronze medallist' is the wordplay.
'a bronze' becomes 'third' (I've seen this in another clue).
'medallist' becomes 'person' (I can't explain this - if you can you should give a lot more credence to this answer).
'third'+'person'='THIRD PERSON'
'was' acts as a link.
Can you help me to learn more?
(Other definitions for third person that I've seen before include "Grammatical category referring to persons or objects spoken of" , "will suggest PC title for Greene novel?" , "could be murderer" , "stopped by Ancient Mariner?" , "Maybe they" .)