Change types of character involved in later art set (13)
I believe the answer is:
transliterate
'change types of character' is the definition.
(transliterating is putting into another alphabet)
'involved in later art set' is the wordplay.
'involved' indicates anagramming the letters (involved can mean confusing or complex).
'in'+'later'+'art'+'set'='inlaterartset'
'inlaterartset' with letters rearranged gives 'TRANSLITERATE'.
(Other definitions for transliterate that I've seen before include "Switch from one alphabet to another" , "Write (word) in letters from another language - narrates title (anag)" , "Switch between alphabets" , "Change into different alphabet" , "Put new letters in" .)