Book that always retains its freshness? (5)
I believe the answer is:
enter
'book that always retains its freshness?' is the definition.
'enter' can be an answer for 'book' (thesaurus). I'm not sure about the remainder of the definition.
'book that always retains' is the wordplay.
'book' becomes 'NT' (New Testament).
'that always' becomes 'eer' (poetic way of saying ever).
'retains' indicates putting letters inside.
'nt' going within 'eer' is 'ENTER'.
Can you help me to learn more?
(Other definitions for enter that I've seen before include "Come in - penetrate - record" , "Get in" , "Set foot in" , "Enrol" , "Infiltrate" .)