Change cast: Tarantino must (13)

I believe the answer is:

transmutation

'change' is the definition.
(transmutation is a kind of change)

'cast tarantino must' is the wordplay.
'cast' is an anagram indicator (letters are dispersed or cast around).
'tarantino'+'must'='tarantinomust'
'tarantinomust' is an anagram of 'TRANSMUTATION'.

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