Crossword Genius

Take a chance with article under test (4)

Ross

I believe the answer is:

beta

'test' is the definition.
(beta test is a kind of test)

'take a chance with article under' is the wordplay.
'take a chance with' becomes 'bet'.
'article' becomes 'a' (indefinite article).
'under' is a charade indicator (letters next to each other).
'bet'+'a'='BETA'

(Other definitions for beta that I've seen before include "2nd letter of Greek alphabet" , "Letter before gamma" , "Second-rate" , "sort of test" , "Character between alpha and gamma" .)

I've seen this clue in The Independent.
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