clear sign
obvious sign

One obvious sign was the music people were working on.

Sometimes this is the most obvious sign of Alzheimer's disease.

There are obvious signs given off by people through their body language.

But they were obvious signs to someone who knew to look.

However, most cases do not come with such obvious signs.

But money is the most obvious sign of how a club feels about a player.

If someone had been in the apartment the night before, there were no obvious signs.

These are the obvious signs of a school in crisis.

The most obvious sign of strain is in his hair.

The next day his body was found, with obvious signs of torture.