Terminus in Wendover (3)
I believe the answer is:
end
'terminus' is the definition.
(thesaurus)
'in wendover' is the wordplay.
'in' indicates the answer is hidden within the clue.
'END' is hidden in the letters of 'wendover'.
(Other definitions for end that I've seen before include "SECOND PART OF 24" , "'Conclusion, finale (3)'" , "death" , "Butt" , "Conclusion, finish" .)