Commit to preserve right for upper class (10)
I believe the answer is:
perpetrate
'commit' is the definition.
(synonyms)
'preserve right for upper class' is the wordplay.
I cannot really understand how this works, but
'right' could be 'r' (common abbreviation) and 'r' is found in the answer.
'class' could be 'rate' (I've seen this before) and 'rate' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'to' acts as a link.
(Other definitions for perpetrate that I've seen before include "Commit (a bad action)" , "Commit (crime)" , "Be responsible for" , "Act" , "Carry out, commit" .)