Enter a clue or pattern or both:
The Clue
Part of SOP (8 letter answer)
The Answer
STANDARD
Tags
Notes
The answer STANDARD is rarely seen, appearing only about once every 1100 puzzles.
Related Clues
Criterion
Norm
___ & Poor's
Basic rule
Comparison basis
Cut-and-dried
Run of the mill
It goes with time
Source of some discrimination
Roman legion eagle, e.g.