By the morning, there was just a 'wisp' [='bit'] of snow left on the ground.
I met her when she was just 'a wisp of a girl'. [=a thin young girl]
There was a 'wisp' of a smile [=a very slight smile] on her lips.
(..) So... that question I've been holding is what purpose is Rene fulfilling? Time is up I have other clients. Though you may not have detected the wisp of Astrakhan fur snagged on a nail from my left shoulder... You couldn't have failed to notice the overpowering aroma of herring pickled in vodka. (..)2011 Sherlock Holmes: A Game of Shadows