"As regular Surgery listeners will know, Dr Mark's talents aren't limited to A&E. He's been DJing since his student days - he's keen to assure us he's not some 'JOHNNY-COME-LATELY!'"
BBC News
Did you know?
Johnny-come-lately Noun phrase
- a newcomer or latecomer (especially a recent recruit to a group, a cause, or a trend).
--- ORIGIN
This phrase originated in the British Navy to describe a new recruit and came into American use in 1825.
You may know the famous song title "Johnny-come-lately" by Steve Earle
"When Johnny Come Lately comes marching home With a chest full of medals and a G.l. loan They'll be waitin' at the station down in San Antone When Johnny comes marching home"
If the newcomer is female, we simply say "Jenny come lately."