Test opposites, right and left primarily (4)

I believe the answer is:

oral

'test' is the definition.
(oral is a type of examination)

'opposites right and left primarily' is the wordplay.
'primarily' suggests taking the first letters.
The initial letters of 'opposites right and left' is 'ORAL'.

(Other definitions for oral that I've seen before include "language exam" , "See 18" , "Verbal" , "Mouth-related" , "Spoken rather than written" .)

I've seen this clue in The Telegraph.

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