Crossword Genius

Possibly fatal contest involving many rounds? (8)

Ross

I believe the answer is:

gunfight

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

'involving many rounds?' is the definition.
I can't judge whether this definition defines the answer.

'possibly fatal contest' is the wordplay.
'possibly fatal' becomes 'gun' (I can't justify this - if you can you should believe this answer much more).
'contest' becomes 'fight' (I've seen this before).
'gun'+'fight'='GUNFIGHT'

Can you help me to learn more?

(Other definitions for gunfight that I've seen before include "Shoot-out (at the OK Corral?)" , "Showdown at the OK Corral" , "Battle in Westerns" , "Shooting conflict" , "At which Wyatt Earp broke the Clanton gang" .)

I've seen this clue in The Sun.
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