Standard passage featuring ultimately esoteric lingo (8)
I believe the answer is:
parlance
'lingo' is the definition.
(I've seen this in another clue)
'standard passage featuring ultimately esoteric' is the wordplay.
'standard' becomes 'par' (standard of play in golf).
'passage' becomes 'lane' (I've seen this in another clue).
'featuring' means one lot of letters goes inside another.
'ultimately' indicates one should take the final letters.
The last letter of 'esoteric' is 'c'.
'lane' placed around 'c' is 'lance'.
'par'+'lance'='PARLANCE'
(Other definitions for parlance that I've seen before include "Earn clap for vocabulary of particular subject" , "Idiom" , "talk!" , "Way of using words" , "Language" .)