Slang (5)
(Other definitions for argot that I've seen before include "manner of speaking" , "Slang for a groat (5)" , "Criminal jargon" , "Patois for groat" , "Cant" .)
'slang' is the definition.
(lingo can mean slang or jargon)
This is all the clue.
(Other definitions for lingo that I've seen before include "Language (slang)" , "Johnny Foreigner speaks one" , "Vernacular" , "Language, colloquially speaking." , "Foreign language or dialect: jargon" .)
'slang' is the definition.
(I know that slang can be written as jargon)
This is all the clue.
(Other definitions for jargon that I've seen before include "Patois, vernacular" , "Professional terminology" , "technical chat" , "variety of zircon" , "Bandied words, possibly" .)