Evaluation of solar involvement (5)
I believe the answer is:
orals
'evaluation' is the definition.
Although both the answer and definition are nouns, they are not in the same form of the noun.
'solar involvement' is the wordplay.
'involvement' is an anagram indicator.
'solar' with letters rearranged gives 'ORALS'.
'of' is the link.
Can you help me to learn more?
(Other definitions for orals that I've seen before include "Tests" , "Spoken exams" .)