Tests of solar layout (5)

I believe the answer is:

orals

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

'solar layout' is the wordplay.
'layout' indicates an anagram (an alternative layout of the letters).
'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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