Held out final edition (6)
I believe the answer is:
lasted
'held out' is the definition.
('last' can be a synonym of 'hold out')
'final edition' is the wordplay.
'final' becomes 'last' ('last' can be a synonym of 'final').
'edition' becomes 'ed'.
'last'+'ed'='LASTED'
(Other definitions for lasted that I've seen before include "Continued for some time, endured" , "Continued, being salted" , "Endured, survived" , "Persisted, endured" , "Kept going" .)