Snoopy is funny (7)
I believe the answer is:
curious
This clue is a double definition.
'snoopy' is the first definition.
(similar in meaning)
'is funny' is the second definition.
(synonyms)
(Other definitions for curious that I've seen before include "Questioning" , "Eager to learn something" , "Odd or eager to know" , "Eager to know something, perhaps nosy" , "Strange, unusual" .)