One and the same, in the third place is a song (6)
I believe the answer is:
anthem
'song' is the definition.
(anthem is a kind of song)
'one and the same in' is the wordplay.
'one' becomes 'an' (I've seen this in other clues).
'and' is a charade indicator (letters next to each other).
'the same in' becomes 'them' (I can't explain this - if you can you should believe this answer much more).
'an'+'them'='ANTHEM'
'the third place is a' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for anthem that I've seen before include "Solemn song" , "Uplifting music" , "National or religious song" , "Internationale?" , "The man for a patriotic song" .)