Caught a clue

To suddenly realize, to understand.

Hey that guy finally moved over into the slow lane for you. Awesome he finally caught a clue.

clue level

Level of being well informed. Usually used with the implication that the clue level is not high enough.

The sysadmin was showing his usual clue level, when I tried to explain the issue.

Donut Clue

When making a selection from an unknown set of donuts, look for a doughnut clue such as fruit or cream. Such clue will be on the side of the donut

Yo! What kind of donut is this?

“Look for a donut clue on the side”