Ignore ticket on unoccupied Bentley (4,2)
I believe the answer is:
pass by
'ignore' is the definition.
(thesaurus)
'ticket on unoccupied bentley' is the wordplay.
'ticket' becomes 'pass' (pass is a kind of ticket).
'on' says to put letters next to each other.
'unoccupied' suggests removing the centre (remove the inside letters which occupy the word).
'bentley' with its centre taken out is 'by'.
'pass'+'by'='PASS BY'
(Other definitions for pass by that I've seen before include "Go past - disregard" , "Move along in the vicinity" , "Leave on one side" , "Go on and leave alone" , "Ignore, overlook" .)