How many letters does the top answer for “album by revolver” have?

The most common answer is contraband (10 letters).

Crossword clue: album by revolver

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

contraband 10 letters wd-fact-v3

goods whose importation or exportation or possession is prohibited by law

libertad 8 letters wd-fact-v3

album by that 50% similar → beautifulworld, everythingchanges, nobodyelse

album by who 50% similar → aquickone, endlesswire, facedances