Add the artwork — all is utter rubbish (10)
I believe the answer is:
illustrate
'add the artwork' is the definition.
'all is utter rubbish' is the wordplay.
'rubbish' indicates anagramming the letters (a poor quality or rubbish spelling of the letters).
'all'+'is'+'utter'='allisutter'
'allisutter' with letters rearranged gives 'ILLUSTRATE'.
(Other definitions for illustrate that I've seen before include "Show" , "Provide with pictures" , "Explain with pictures" , "Ornament" , "Exemplify" .)