As a headdress, it's wrong for an artist (5)
I believe the answer is:
tiara
'as a headdress' is the definition.
I can't tell whether this definition defines the answer.
'it's wrong for an artist' is the wordplay.
'wrong' is an anagram indicator.
'for' says to put letters next to each other.
'an' becomes 'a'.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'it' anagrammed gives 'ti'.
'ti'+'a'+'ra'='TIARA'
Can you help me to learn more?
(Other definitions for tiara that I've seen before include "pope may have been topped by one" , "Ornamental crescent-shaped headdress or Pope's diadem" , "Jewelled, ornamental headgear" , "Jewelled head band" , "Decorative headband" .)