Shot during curtain of fire (2-3)

I believe the answer is:

in-off

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(Other definitions for in-off that I've seen before include "Indirect billiards shot" , "Type of cannon in billiards" , "Billiards/snooker stroke" , "Foul (snooker), scoring stroke (billiards)" , "Glancing billiards pot" .)

I've seen this clue in The Independent.

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