In class, when something is not clear, you should:

1 easily seen through

• the clear glass walls of the aquarium's giant ocean tank

2 not subject to misinterpretation or more than one interpretation

• the meaning of her broad smile was clear to the whole class

3 having or showing a mind free from doubt

• I need to be absolutely clear about what you're saying

4 not stormy or cloudy

• novice pilots can only fly on clear days

5 serving to put an end to all debate or questioning

• the evidence is clear: he's innocent

6 allowing passage without obstruction

• flooding was widespread, and only some roads are clear so far

7 free from guilt or blame

• slept with a clear conscience

8 giving off or reflecting much light

• spermaceti candles were once highly prized for the clear flame that they produced