There is no need to say any more, as plenty at school get help (6,4)
I believe the answer is:
enough said
'there is no need to say any more' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'plenty at school get help' is the wordplay.
I cannot really understand how this works, but
'plenty' could be 'enough' ('enough' can be a synonym of 'plenty') and 'enough' is found within the answer.
'school' could be 's' and 's' is found within the answer.
'help' could be 'aid' ('aid' can be a synonym of 'help') and 'aid' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'as' acts as a link.
Can you help me to learn more?
(Other definitions for enough said that I've seen before include "No need for comment" , "there's nothing to add" .)