Some patent errors to put in a book (5)
I believe the answer is:
enter
'put in a book' is the definition.
'enter' can be an answer for 'book' (thesaurus). I am not certain of the 'put in a' bit.
'some patent errors to' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ENTER' can be found hidden inside 'patent errors to'.
Can you help me to learn more?
(Other definitions for enter that I've seen before include "Take part in a contest" , "Come in - register" , "put in for a race" , "A key on the right" , "Come in - penetrate - record" .)