Traditional voters cave in, unfortunately (12)
I believe the answer is:
conservative
'traditional' is the definition.
(thesaurus)
'voters cave in unfortunately' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'voters'+'cave'+'in'='voterscavein'
'voterscavein' with letters rearranged gives 'CONSERVATIVE'.
(Other definitions for conservative that I've seen before include "right-wing?" , "square" , "Averse to change" , "Traditional; cautious" , "True blue" .)