Enter a clue or pattern or both:
The Clue
By the book (8 letter answer)
The Answer
STRICTLY
Tags
Notes
The answer STRICTLY is so rare that it appears less than once every 2500 puzzles.
Definition
STRICTLY as an adverb:
1. (strictly, purely) = restricted to something; "we talked strictly business"
2. (strictly, stringently) = in a stringent manner; "the laws are stringently enforced"; "stringently controlled"
3. (rigorously, strictly) = in a rigorous manner; "he had been trained rigorously by the monks"