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(ˈwɪl ə ðəˈwɪsp)

2. anything that deludes or misleads by luring on; an elusive thing or person.
[1600–10; orig. Will (i.e., William) with the wisp]
References in classic literature ?
The first is the taste, Which is meager and hollow, but crisp: Like a coat that is rather too tight in the waist, With a flavor of Will-o-the-wisp.
Paddy Bradley and Paul Murphy were outstanding while Colm Devlin is a real will-o-the-wisp type player.
Now given that it costs the council taxpayer a great deal of money to clean up after these will-o-the-wisp urban artistic guerrillas, you might have been forgiven for thinking that Reuven Fletcher, for that is the officer's name, is paid to co-ordinate the clean up and prosecution of those who daub on the walls of underpasses, bus shelters and such like.