Comply with primary obligation by educating youngsters (4)
I believe the answer is:
obey
'comply with' is the definition.
(I've seen this before)
'primary obligation by educating youngsters' is the wordplay.
'primary' suggests taking the first letters.
The first letters of 'obligation by educating youngsters' is 'OBEY'.
(Other definitions for obey that I've seen before include "Be dominated" , "Abide by" , "Heed" , "Carry out (an order)" , "Follow orders" .)