Permit six, as ordered (4)
I believe the answer is:
visa
'permit' is the definition.
(I've seen this before)
'six as ordered' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'ordered' indicates an anagram.
'as' is an anagram of 'sa'.
'vi'+'sa'='VISA'
(Other definitions for visa that I've seen before include "Travel document is required to enter Virginia" , "giving you access to capital?" , "Endorsement made in a passport" , "It allows the bearer to enter the country issuing it" , "Travel permit stamped in passport etc" .)