Reduce, relegate (6)
I believe the answer is:
demote
I believe this is a double definition.
'reduce' is the first definition.
(I've seen this in another clue)
'relegate' is the second definition.
(synonyms)
(Other definitions for demote that I've seen before include "Reduce in status" , "Move to lower status" , "Put down in rank" , "Downgrade" , "Move down in rank" .)