Language used in press release ahead of summit? (8)
I believe the answer is:
newspeak
'language' is the definition.
(language in the novel Nineteen Eighty-Four)
'press release ahead of summit?' is the wordplay.
'press release' becomes 'news'.
'ahead of' says to put letters next to each other (I've seen this in other clues).
'summit?' becomes 'peak' ('peak' can be a synonym of 'summit').
'news'+'peak'='NEWSPEAK'
'used in' is the link.
(Other definitions for newspeak that I've seen before include "Propaganda language in nineteen eighty-four" , "fictional language" , "Orwell's nineteen eighty four language" , "Language of 1984 (Orwell)" , "Deliberately ambiguous (Orwellian) language" .)