Sensitive part is ticklish, in part (8)
I believe the answer is:
artistic
'sensitive' is the definition.
'part is ticklish in part' is the wordplay.
'in part' indicates the answer is hidden within the clue.
'ARTISTIC' is hidden in the letters of 'part is ticklish'.
(Other definitions for artistic that I've seen before include "Having creative skills" , "Skilled at painting, music etc" , "cultivated" , "Creative; ornamental" , "Aesthetic, creative" .)