Are you saying “He thinks he is only clever in our class” to tell about someone who always thinks that they are intelligent than they are in your class? Using ‘Clever’ word is the right word in your sentence. You can use it but there is another perfect word that is suitable and gives correct meaning to your sentence. That is…
Word: Big-headed
Part of speech: Adjective
Meaning: Thinking you are important and intelligent than you are.
USAGE AND EXAMPLES OF BIG-HEADED:
EXAMPLE I:
My neighbour is a big-headed. There is no point in caring his words.
Explanation:
Here I say my neighbour always thinks he is only intelligent than others.
EXAMPLE II:
Rajini: Ragini is big-headed. That is why she did not spend more time with you.
Explanation:
Rajini says that Ragini thinks she is important than all.