How many letters does the top answer for “someone who collaborates with an enemy occupying force” have?

The most common answer is collaborationist (16 letters).

Crossword clue: someone who collaborates with an enemy occupying force

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

collaborationist 16 letters wn-def

someone who collaborates with an enemy occupying force

quisling 8 letters wn-def

someone who collaborates with an enemy occupying force