Record of performance in unusual location regarding essential study? (11)
I believe the answer is:
ontological
'record of performance in unusual location' is the definition.
Although both the answer and definition are adjectives, I cannot see how one could define the other.
'regarding essential study?' is the wordplay.
I cannot really understand how this works, but
'regarding' could be 'on' (on or regarding a particular topic) and 'on' is located in the answer.
'study?' could be 'logic' (logic is a kind of study) and 'logic' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for ontological that I've seen before include "metaphysical" , "Like argument for God" .)