Arrogant person puts out painting (7)
I believe the answer is:
upstart
'arrogant person' is the definition.
'puts out painting' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'painting' becomes 'art' (painting is an art).
'puts' anagrammed gives 'upst'.
'upst'+'art'='UPSTART'
(Other definitions for upstart that I've seen before include "Person who has risen quickly, and arrogant with it" , "someone pretentious" , "Arrogant person new in high position" , "Arriviste, parvenu" , "Arrogant Johnny-come-lately" .)