Language from some personnel in Government (5)
I believe the answer is:
'language' is the definition.
(lingo is a kind of language)
'some personnel in government' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'LINGO' can be found hidden inside 'personnel in government'.
'from' is the link.
(Other definitions for lingo that I've seen before include "speech" , "Johnny Foreigner speaks one" , "Parlance" , "Language, colloquially speaking." , "Jargon, foreign language (informal)" .)