Virgin, United in Dulles manoeuvre (9)
I believe the answer is:
unsullied
'virgin' is the definition.
(thesaurus)
'united in dulles manoeuvre' is the wordplay.
'united' becomes 'u'.
'manoeuvre' is an anagram indicator.
'in'+'dulles'='indulles'
'indulles' is an anagram of 'nsullied'.
'u'+'nsullied'='UNSULLIED'
(Other definitions for unsullied that I've seen before include "Pure" , "Not tarnished" , "Spotlessly clean, free from blemishes" .)