Leaders of the Temperance League organised training (8)
I believe the answer is:
tutelage
'training' is the definition.
(I've seen this before)
'leaders of the temperance league organised' is the wordplay.
'leaders of' indicates taking the first letters.
'organised' indicates an anagram.
The initial letters of 'the temperance' is 'tt'.
'tt'+'league'='ttleague'
'ttleague' with letters rearranged gives 'TUTELAGE'.
(Other definitions for tutelage that I've seen before include "Office of tutor or guardian" , "Schooling" , "Guardianship; instruction" , "Tuition" , "guidance" .)