Johnnie-come-lately - Idioms by The Free Dictionary
Johnnie-come-lately and JCL
n. someone new to a situation or status. This Johnnie-come-lately doesn’t know what it was like in the old days.
References in periodicals archive
Okay, the spelling might be slightly differen, and the stakes very slightly lower but Coventry's Johnnie-come-lately
reacted in the same cool-headed way as his more famous namesake.