Related Clues:

• No rebel, hard-working student said to be on the ball
• Be aware
• Recognise
• Be dangerously well informed
• Be certain about making a thousand at once
• Ken and Kelvin got up
• Start for "it all" or "nothing"
• Have the 411
• Doesn¿t sound like something positive to be aware of
• Be absolutely sure
• Understand, as a language
• Be certain
• Don't have to guess
• A Channel port, type of sole
• Recognise its pronouncement is negative