Relegated due to a test, indeed! (7)
I believe the answer is:
demoted
'relegated' is the definition.
('demote' can be a synonym of 'relegate')
'a test indeed' is the wordplay.
I cannot quite understand how this works, but
'test' could be 'mot' (as in an MOT test for a vehicle) and 'mot' is located in the answer.
The remaining letters 'deed' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'due to' acts as a link.
Can you help me to learn more?
(Other definitions for demoted that I've seen before include "Relegated" , "Slippery fish" , "Reduced in rank" , "Put down in rank" , "Downgraded" .)