Crossword Genius

One prepared to compromise who wins a second medal? (9)

Ross

I believe the answer is:

bargainer

I'm a little stuck... Click here to teach me more about this clue!

'second medal?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'one prepared to compromise who wins a' is the wordplay.
I cannot really understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
'a' could be 'an' and 'an' is found within the remaining letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for bargainer that I've seen before include "Negotiator" , "Person after good deal" .)

I've seen this clue in The Times.
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