Spill the beans - many pupils have not been here much this year! (6)
I believe the answer is:
inform
'spill the beans' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for inform that I've seen before include "snitch?" , "Notify or tell" , "Give information to (someone)" , "Provide facts - playing well" , "effective" .)