Horrified, scallywag has tickled nurses (6)
I believe the answer is:
aghast
'horrified' is the definition.
(I've seen this before)
'scallywag has tickled nurses' is the wordplay.
'nurses' indicates a hidden word (nurse can mean holding closely).
'AGHAST' is hidden within 'scallywag has tickled'.
(Other definitions for aghast that I've seen before include "Horrified, appalled" , "'Horrified, shocked (6)'" , "Filled with terror" , "Filled with fear or horror" , "in awe" .)