How many letters does the top answer for “city in seine” have?

The most common answer is colombes (8 letters).

Crossword clue: city in seine

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

colombes 8 letters wd-fact-v3

vitrysurseine 13 letters wd-fact-v3

city in hauts-de-seine 50% similar → colombes, rueilmalmaison

city in seine-et-oise 50% similar → tremblayenfrance

city in seine-saint-denis 50% similar → tremblayenfrance