I start to become a painter (6)
I believe the answer is:
artist
'a painter' is the definition.
(painter is an example)
'i start to become' is the wordplay.
'to become' indicates anagramming the letters.
'i'+'start'='istart'
'istart' is an anagram of 'ARTIST'.
(Other definitions for artist that I've seen before include "Bacon, for example?" , "Craftsman" , "Painter, sculptor etc" , "A painter, sculptor or other creative person" , "eg Monet" .)