Outside, you think, meant to create a diversion (9)
I believe the answer is:
amusement
'a diversion' is the definition.
(amusement is a kind of diversion)
'outside you think meant to create' is the wordplay.
'outside you' indicates putting letters inside (I've seen this in other clues).
'think' becomes 'muse' (musing is a kind of thinking**).
'to create' is an anagram indicator.
'meant' anagrammed gives 'ament'.
'muse' going within 'ament' is 'AMUSEMENT'.
(Other definitions for amusement that I've seen before include "Entertainment" , "Idle wasting of time" , "Light-hearted pastime" , "(State of) finding something funny" , "Diversion, recreation" .)