Party justifies targets to some extent (6)
I believe the answer is:
fiesta
'party' is the definition.
(thesaurus)
'justifies targets to some extent' is the wordplay.
'to some extent' indicates the answer is hidden within the clue.
'FIESTA' is hidden within 'justifies targets'.
(Other definitions for fiesta that I've seen before include "Outdoor celebration" , "Spanish party" , "Latin American celebration" , "Festival, fete" , "Festivity, celebration" .)