Specialist language used to describe advance in painting? (5)
I believe the answer is:
argot
'specialist language used to describe' is the definition.
I can't tell whether this definition defines the answer.
'advance in painting?' is the wordplay.
'advance' becomes 'go' (to advance is to go forward).
'in' means one lot of letters goes inside another.
'painting?' becomes 'art' (painting is an art).
'go' going into 'art' is 'ARGOT'.
Can you help me to learn more?
(Other definitions for argot that I've seen before include "Kind of slang" , "Cant" , "Slang of a particular group, originally thieves" , "Language of a particular group" , "Criminal jargon" .)