What does observing mean in crosswords?

observing means: quick to notice; showing quick and keen perception

Which crossword clues can have observing as the answer?

Possible clues for observing include "Keen watch".

Word entry · 9 letters

Best crossword clue

"Keen watch"

9 letters · collected on this word page

9 lettersSorted beginorsvStarts with OEnds with G1 clues

1O2B3S4E5R6V7I8N9G

01“Keen watch”9 letters

Not quite right?

O________