A number upset wise man and artist (5)
I believe the answer is:
degas
'artist' is the definition.
(I've seen this before)
'a number upset wise man' is the wordplay.
'a number' becomes 'd' (D is an example**).
'upset' says the letters should be written in reverse.
'wise man' becomes 'sage' (sage is a kind of wise man).
'sage' back-to-front is 'egas'.
'd'+'egas'='DEGAS'
'and' acts as a link.
(Other definitions for degas that I've seen before include "Edgar -, Fr. sculptor/ painter" , "French impressionist painter, d. 1917" , "He produced works of art" , "Edgar -, c. Nineteen-twenty Fr. painter" , "He painted dancers" .)