Director Jack with opposite number (9)
I believe the answer is:
tarantino
'director' is the definition.
(I've seen this before)
'jack with opposite number' is the wordplay.
'jack' becomes 'tar' (I've seen this before).
'with' says to put letters next to each other.
'opposite' becomes 'anti'.
'number' becomes 'no' (abbreviation for 'number').
'tar'+'anti'+'no'='TARANTINO'
(Other definitions for tarantino that I've seen before include "Quentin -, American film director" , "He makes films" , "Who in tarnation is this US film-maker?" , "Quentin ... film maker" , "Quentin -, US director" .)