Teach mob about enormous sacrifice (8)
I believe the answer is:
hecatomb
'enormous sacrifice' is the definition.
'hecatomb' can be an answer for 'sacrifice' (hecatomb is a kind of sacrifice). I'm not certain of the 'enormous' bit.
'teach mob about' is the wordplay.
'about' indicates an anagram.
'teach'+'mob'='teachmob'
'teachmob' with letters rearranged gives 'HECATOMB'.
Can you help me to learn more?
(Other definitions for hecatomb that I've seen before include "major sacrifice" , "great public sacrifice" , "Large-scale sacrifice" , "big sacrifice" , "sacrifice victims" .)