Flipping internally shoot projectile (4)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

The answer had to be DART which looked like it was DRAT (‘flipping’ as an interjection?) with the middle letters ‘flipping’ but then ‘flipping was doing double duty and we then had two definitions. Bert eventually worked out that SHOOT is an American interjection similar to DRAT in the UK.