Genial little trio (6)
I believe the answer is:
jovial
'genial' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for jovial that I've seen before include "Convivial" , "Full of mirth" , "Genial, joyous" , "Cheerful, lively" , "Good-humoured, cheerful" .)