Aesthetically pleasing section of chart is ticked (8)
I believe the answer is:
artistic
'aesthetically pleasing' is the definition.
(I've seen this before)
'section of chart is ticked' is the wordplay.
'section of' indicates the answer is hidden within the clue.
'ARTISTIC' can be found hidden inside 'chart is ticked'.
(Other definitions for artistic that I've seen before include "Expressive" , "Showing creative skill" , "I stir cat (anag.)" , "Fine-looking" , "Naturally creative" .)