Tories lure out undecided (10)
I believe the answer is:
irresolute
'undecided' is the definition.
(thesaurus)
'tories lure out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'tories'+'lure'='torieslure'
'torieslure' anagrammed gives 'IRRESOLUTE'.
(Other definitions for irresolute that I've seen before include "lacking clear purpose" , "Indecisive" , "Hesitating" , "Hesitant, uncertain" .)