End of the memo about a girl (6)
I believe the answer is:
elaine
'girl' is the definition.
(girl's name)
'end of the memo about a' is the wordplay.
'end of' suggests the final letters.
'memo' becomes 'line' (I can't justify this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
The final letter of 'the' is 'e'.
'line' placed around 'a' is 'laine'.
'e'+'laine'='ELAINE'
Can you help me to learn more?
(Other definitions for elaine that I've seen before include "Woman" , "Name" , "Mother of sir Galahad" , ""The lily maid of Astolat"" , "Girl" .)