Preamble reviewed, in short nine times (5)
I believe the answer is:
intro
'preamble' is the definition.
(I've seen this before)
'reviewed in short nine times' is the wordplay.
'reviewed' says the letters should be written in reverse.
'in' indicates the answer is hidden within the clue.
'ortni' can be found hidden inside 'short nine times'.
'ortni' backwards is 'INTRO'.
(Other definitions for intro that I've seen before include "First passage of play" , "Preliminary section (of music) (colloq.)" , "preface" , "First bars of a musical composition" , "Opening instrumental passage of song" .)