Souvenir of yours truly, without article, meant nothing (7)
I believe the answer is:
memento
'souvenir' is the definition.
(I know that souvenir can be written as memento)
'yours truly without article meant nothing' is the wordplay.
'yours truly' becomes 'me' (the person that set this crossword).
'without' is a deletion indicator.
'article' becomes 'a' (the indefinite article in English).
'nothing' becomes 'O' (looks like zero - 0).
'meant' with 'a' taken away is 'ment'.
'me'+'ment'+'o'='MEMENTO'
'of' acts as a link.
(Other definitions for memento that I've seen before include "Souvenir, reminder of past events" , "Reminder that death is inevitable" , "Souvenir, reminder of past event" , "A reminder of death - . . . . . . . mori" , "Reminder of a person or event" .)