Crossword clue: having separated or advocating separation from another entity or policy or attitude
3 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
the act of breaking away or withdrawing from
having separated or advocating separation from another entity or policy or attitude
an advocate of secession or separation from a larger group (such as an established church or a national union)