Cleverly is an adverb, yes.
Some example sentences are:
The dog cleverly opened the gate.
He cleverly answered all the sums on the blackboard.
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No. Clever is an adjective. The corresponding adverb is cleverly.
cleverly
No, it is not an adverb. Truthful is an adjective, and the adverb form is "truthfully."
adverb is word that modified a verb,adjective.or other adverb
actually, there are 4 types of adverb.1. adverb of manner2. adverb of time3. adverb of place4. adverb of frequency