Pretty women's pants worn by Raider (7)
I believe the answer is:
winsome
'pretty' is the definition.
(thesaurus)
'women's pants worn by raider' is the wordplay.
'pants' indicates anagramming the letters (UK informal term for 'nonsense' or 'rubbish').
'worn by' means one lot of letters goes inside another (outside letters are worn by those on the inside).
'raider' becomes 'I' (where the crossword setter is 'Raider').
'womens' with letters rearranged gives 'wnsome'.
'wnsome' going around 'i' is 'WINSOME'.
(Other definitions for winsome that I've seen before include "Fetching" , "Attractive and fresh" , "Charming - sweet" , "Appealingy attractive" , "Attractive and appealing" .)