Risk taken with article still being tested? (4)
I believe the answer is:
beta
'still being tested?' is the definition.
(as in a beta version)
'risk taken with article' is the wordplay.
'risk' becomes 'bet' (I've seen this in another clue).
'taken with' is a charade indicator (letters next to each other).
'article' becomes 'a' (the indefinite article in English).
'bet'+'a'='BETA'
(Other definitions for beta that I've seen before include "Greek character - not quite top-notch" , "testing stage" , "sort of test" , "It's next after alpha" , "Letter before gamma" .)