Relegates set turning up after protest march (7)
I believe the answer is:
demotes
'relegates' is the definition.
('demote' can be a synonym of 'relegate')
'set turning up after protest march' is the wordplay.
I cannot quite see how this works, but
an anagram of 'set' is 'tes' which is within the answer.
'protest' could be 'demo' (demonstration) and 'demo' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for demotes that I've seen is " Lowers in rank".)