Similar in nature (7)
(Other definitions for kindred that I've seen before include "Relationship by blood" , "Related (people)" , "Congenial" , "Related; similar in kind" , "These spirits have similar tastes" .)
'similar in nature' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for akin that I've seen before include "Similar in quality" , "Similar, like" , "Of a similar nature" , "Seemingly related" , "Having similar characteristics" .)