A nickclegg is a cross-eyed well monster from Irish folklore. Since it possesses no genitals or brains it really only presented danger to especially stupid children who play in wells. Also the inspiration for the nursery rhyme:
Nickclegg, Nickclegg
Fall down the playing well
and he'll dry-hump your leg
No matter how very much you beg
or kick or scream or rebel,
There's no escaping foul Nickclegg
