The most common and most likely answer to this crossword clue is the 2 plus 4 plus 3 plus 3 letter word OF MICE AND MEN
I've seen this crossword clue in The Times
O
F
M
I
C
E
A
N
D
M
E
N
More clues leading to the result OF MICE AND MEN
- Commend a fine new novel
- Book about aspects of computer chess games?
- Give order to find Emma once — or another book
- Best-laid plans
- Commend a fine novel or novella
- Novel with troops succeeds among faint-hearts
- Doctor returning during famine, once energised, for treatment of migrant workers?
- Commend a fine stirring story by Steinbeck
Buddy explains!

The straight part
We know that "another book" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case another book = of mice and men.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.