Enter a clue or pattern or both:
The Clue
Adder's activity (10 letter answer)
The Answer
TABULATING
Tags
Notes
The answer TABULATING is so rare that it appears less than once every 2500 puzzles.
Definition
TABULATE as a verb:
1. (tabularize, tabularise, tabulate) = arrange in tabular form
2. shape or cut with a flat surface