Debate ends with Ovid unusually bereft (6)
I believe the answer is:
devoid
'bereft' is the definition.
(I've seen this in another clue)
'debate ends with ovid unusually' is the wordplay.
'ends' says to hollow out the word (remove centre letters).
'with' says to put letters next to each other.
'unusually' indicates an anagram.
'debate' with its middle taken out is 'de'.
'ovid' is an anagram of 'void'.
'de'+'void'='DEVOID'
(Other definitions for devoid that I've seen before include "Entirely lacking" , "Bereft" , "Lacking or free from" , "Completely lacking" , "Empty - do dive (anag)" .)