Enter a clue or pattern or both:
The Clue
Did thorough research (6 letter answer)
The Answer
DELVED
Tags
Notes
The answer DELVED is so rare that it appears less than once every 2500 puzzles.
Definition
DELVE as a verb:
1. (dig, delve, cut into, turn over) = turn up, loosen, or remove earth; "Dig we must"; "turn over the soil for aeration"