Lingo's standard weapon (8)
I believe the answer is:
parlance
'lingo's' is the definition.
(I've seen this in another clue)
'standard weapon' is the wordplay.
'standard' becomes 'par' (standard of play in golf).
'weapon' becomes 'lance' (lance is a kind of weapon).
'par'+'lance'='PARLANCE'
(Other definitions for parlance that I've seen before include "Earn clap for vocabulary of particular subject" , "Manner of speaking peculiar to a specific group" , "talk!" , "Way of speaking" , "Language" .)