Rifle fire (4)

I believe the answer is:

sack

I believe this is a double definition.

'rifle' is the first definition.
(I've seen this before)

'fire' is the second definition.
(dismiss someone from their job)

(Other definitions for sack that I've seen before include "See 12" , "Plunder - large bag" , "Large bag; dismiss" , "Flour or grain bag" , "Plundering of captured town" .)

I've seen this clue in The Independent, The Guardian, The Telegraph, The Times, The Globe and Mail and the Sydney Morning Herald.

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