Kind of inquiry about my competence (7)
I believe the answer is:
amiable
'kind' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for amiable that I've seen before include "'Affable, genial (7)'" , "Of sweet and friendly disposition" , "Friendly, kindly" , "Lovable, friendly" , "'Friendly, pleasant and good-tempered (7)'" .)