Move pages back after a sneak preview (9)
I believe the answer is:
appetiser
'sneak preview' is the definition.
(appetiser can mean a preview or teaser)
'move pages back after a' is the wordplay.
'move' becomes 'resite' (move to a new site).
'pages' becomes 'pp' (an abbreviation for page written twice).
'back' shows that the letters should be reversed in order.
'after' is a charade indicator (letters next to each other).
'resite'+'pp'='resitepp'
'resitepp' reversed gives 'ppetiser'.
'ppetiser' put after 'a' is 'APPETISER'.
(Other definitions for appetiser that I've seen before include "Hors d'oeuvre" , "Aperitif" , "Small starter dish" , "first course maybe" , "Antipasto" .)