New manual on etiquette originally provided for former students (7)
I believe the answer is:
alumnae
'for former students' is the definition.
(I've seen this before)
'new manual on etiquette originally' is the wordplay.
'new' is an anagram indicator.
'on' means one lot of letters go next to another.
'originally' says to take the initial letters.
The first letter of 'etiquette' is 'e'.
'manual' is an anagram of 'alumna'.
'alumna'+'e'='ALUMNAE'
'provided' acts as a link.
(Other definitions for alumnae that I've seen before include "Former female pupils" , "Women who have studied" , "Former students" , "Graduates of a college" .)