Kind and clever person, not yours truly! (5)
I believe the answer is:
genus
'kind' is the definition.
(a genus is a kind or type of something)
'clever person not yours truly' is the wordplay.
'clever person' becomes 'genius'.
'not' is a deletion indicator.
'yours truly' becomes 'I' (the person that set this crossword).
'genius' with 'i' taken out is 'GENUS'.
'and' is the link.
(Other definitions for genus that I've seen before include "Kind or sort of" , "The Homo of Homo sapiens?" , "species grouped together" , "group of organisms" , "Division of family" .)