Supervisors inspired by alternative idea not referred to previously (14)
I believe the answer is:
aforementioned
'referred to previously' is the definition.
I can't tell whether this definition defines the answer.
'supervisors inspired by alternative idea not' is the wordplay.
I cannot really see how this works, but
'supervisors' could be 'foremen' (foreman is a kind of supervisor) and 'foremen' is found in the answer.
'by' could be 'at' and 'at' is located in the remaining letters.
'not' could be 'o' (I've seen this in other clues) and 'o' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for aforementioned that I've seen before include "previously laid down" , "previously cited" , "alluded to previously" , "previously stated" .)