Tried part of latest edition (6)
I believe the answer is:
tested
'tried' is the definition.
(synonyms)
'part of latest edition' is the wordplay.
'part of' indicates a hidden word.
'TESTED' is hidden in the letters of 'latest edition'.
(Other definitions for tested that I've seen before include "Subjected to examination or trial" , "Trialled" , "Put to the proof" , "Tried or examined" , "Proved" .)