Standard way to get round initially common manner of speaking (8)
I believe the answer is:
parlance
'manner of speaking' is the definition.
(I've seen this before)
'standard way to get round initially common' is the wordplay.
'standard' becomes 'par' (I've seen this before).
'way' becomes 'lane' (lane is a kind of way**).
'to get round' means one lot of letters goes inside another.
'initially' suggests taking the first letters.
The initial letter of 'common' is 'c'.
'lane' going around 'c' is 'lance'.
'par'+'lance'='PARLANCE'
(Other definitions for parlance that I've seen before include "Jargon" , "Language" , "Idiom" , "Earn clap for vocabulary of particular subject" , "Way of using words" .)