Turn in the history books (7)
I believe the answer is:
annuals
'books' is the definition.
(annual is a kind of book)
'turn in the history' is the wordplay.
'turn' becomes 'u' (a 'U-turn' is a kind of turn).
'in the' means one lot of letters goes inside another.
'history' becomes 'annals' (annals is a kind of history).
'u' placed into 'annals' is 'ANNUALS'.
(Other definitions for annuals that I've seen before include "Books published once a year" , "regular publications" , "Yearly plants" , "regular books" , "Yearbooks" .)