This is the 8533rd most frequent German word.
klem
The word "klem" is not standard German; it may be a misspelling or dialect.
The word 'Klemm(e)' here denotes a physical clamp used to hold the book.
Ich habe ein Buch mit einer Klemme befestigt.
I secured a book using a clamp.
The word 'Klemme' in this sentence refers to a difficult situation or pinch.
Er befindet sich in einer finanziellen Klemme.
He is in a financial pinch.
Again, 'Klemme' is used to refer to a physical object, specifically a cable clamp.