No romanticist lies about art. (7)
I believe the answer is:
realist
'no romanticist' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'lies about art' is the wordplay.
'about' is an anagram indicator.
'lies' with its letters anagrammed with 'art' gives 'REALIST'.
Can you help me to learn more?
(Other definitions for realist that I've seen before include "Person who sees things without illusions" , "One with a pragmatic attitude" , "Writer like Balzac" , "One without illusions" , "Pragmatic person" .)