Position not conducive to firing CO? (4-4)

I believe the answer is:

half-cock

I believe this is a double definition.

'position not conducive to firing' is the first definition.
(setting in which a firearm cannot be fired)

'co?' is the second definition.
(half of the word 'cock')

(Another definition for half-cock that I've seen is " Not a good thing to go off at".)

I've seen this clue in The Guardian.

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