Beginning of first article (5)
I believe the answer is:
start
'beginning' is the definition.
(I know that beginning can be written as start)
'of first article' is the wordplay.
'of' indicates the answer is hidden within the clue.
'START' is hidden in the letters of 'first article'.
(Other definitions for start that I've seen before include "Jump suddenly" , "Begin to recoil?" , "Outset" , "Begin with sudden movement of surprise" , "Begin - opening move" .)