We sent out the most up-to-date (6)
I believe the answer is:
newest
'the most up-to-date' is the definition.
(I've seen this in another clue)
'we sent out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'we'+'sent'='wesent'
'wesent' is an anagram of 'NEWEST'.
(Other definitions for newest that I've seen before include "Most original" , "Freshest, most recent" , "most recently released?" , "Most recent or least worn" , "Latest novel" .)