Bring up? It’s brought up by the laggardly (4)
I believe the answer is:
rear
'bring up?' is the definition.
(as in rearing children)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rear that I've seen before include "early, long before now" , "Hind part" , "Rump" , "Foster" , "Buttocks - rise up" .)