New edition sure is different, last of three (7)
I believe the answer is:
reissue
'new edition' is the definition.
'reissue' can be an answer for 'edition' (thesaurus). I am unsure of the 'new' bit.
'sure is different last of three' is the wordplay.
'different' indicates an anagram (letters placed in a different order).
'last of' suggests the final letters.
The final letter of 'three' is 'e'.
'sure'+'is'='sureis'
'sureis' with letters rearranged gives 'reissu'.
'reissu'+'e'='REISSUE'
Can you help me to learn more?
(Other definitions for reissue that I've seen before include "Circulate a second time" , "Republish" , "Again 22 across" , "Old record" , "Send out again" .)