How many letters does the top answer for “money paid for the support of a barbican.” have?

The most common answer is barbacanage (11 letters).

Crossword clue: money paid for the support of a barbican.

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

barbacanage 11 letters web-def

See Barbicanage.

barbicanage 11 letters web-def

Money paid for the support of a barbican. [Obs.]

for which money is paid 50% similar → compensable, remunerative, stipendiary