A rule cited to make an accusation (7)
I believe the answer is:
arraign
'make an accusation' is the definition.
'a rule cited' is the wordplay.
I cannot quite understand how this works, but
'a' is found in the answer.
'rule' could be 'r' (legal abbreviation) and 'r' is found in the answer.
This may be the basis of clue (or it may be nonsense).
'to' is the link.
(Other definitions for arraign that I've seen before include "put on a charge" , "Accuse before tribunal" , "Indict, accuse" , "Call before court to answer criminal charge" , "Call to account" .)