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Medic neutered them accidentally but isn't discouraged (10)

Ross

I believe the answer is:

undeterred

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'medic neutered them accidentally' is the definition.
I can't judge whether this definition defines the answer.

'isn't discouraged' is the wordplay.
'isn't' becomes 'un' (I can't justify this - if you can you should believe this answer much more).
'discouraged' becomes 'deterred' ('deter' can be a synonym of 'discourage').
'un'+'deterred'='UNDETERRED'

'but' is the link.

Can you help me to learn more?

(Other definitions for undeterred that I've seen before include "Nothing daunted" , "Not put off" , "Ignoring danger" , "going on regardless" , "without hindrance" .)

I've seen this clue in The Irish Times.
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