Information, given prior to summit, in contradictory language (8)
I believe the answer is:
newspeak
'language' is the definition.
(language in the novel Nineteen Eighty-Four)
'information given prior to summit in contradictory' is the wordplay.
I cannot quite see how this works, but
'information' could be 'news' (news is a kind of information) and 'news' is found within the answer.
'summit' could be 'peak' (mountain peak) and 'peak' is present in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for newspeak that I've seen before include "bureaucratic language" , "language of politicians, perhaps" , "Language of 1984 (Orwell)" , "Deliberately ambiguous (Orwellian) language" , "Propaganda language in nineteen eighty-four" .)