Raises (children) (6,2)
'raises children' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rears that I've seen before include "Raises" , "Sets up" , "Fosters, brings up" , "Back ends" , "bucks" .)
(Other definitions for brings up that I've seen before include "how one rears children" , "Mentions" .)