Effort that goes “Pfft!”

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Possible Answers:

DUD.

Last seen on: NY Times Crossword 24 Nov 20, Tuesday

Random information on the term “DUD”:

Bomb disposal is an explosives engineering profession using the process by which hazardous explosive devices are rendered safe. Bomb disposal is an all-encompassing term to describe the separate, but interrelated functions in the military fields of explosive ordnance disposal (EOD) and improvised explosive device disposal (IEDD), and the public safety roles of public safety bomb disposal (PSBD) and the bomb squad.

The first professional civilian bomb squad was established by Sir Vivian Dering Majendie. As a Major in the Royal Artillery, Majendie investigated an explosion on 2 October 1874 in the Regent’s Canal, when the barge ‘Tilbury’, carrying six barrels of petroleum and five tons of gunpowder, blew up, killing the crew and destroying Macclesfield Bridge and cages at nearby London Zoo.

In 1875, he framed The Explosives Act, the first modern legislation for explosives control. He also pioneered many bomb disposal techniques, including remote methods for the handling and dismantling of explosives. His advice during the Fenian dynamite campaign of 1881–85 was officially recognised as having contributed to the saving of lives. After Victoria Station was bombed on 26 February 1884 he defused a bomb with a clockwork mechanism which might have gone off at any moment.

DUD on Wikipedia