Solar form of tests (5)

I believe the answer is:

orals

'tests' is the definition.
(oral is a kind of test)

'solar form' is the wordplay.
'form' indicates an anagram.
'solar' anagrammed gives 'ORALS'.

'of' is the link.

(Other definitions for orals that I've seen before include "Tests" , "Spoken exams" .)

I've seen this clue in The Mirror.

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