What is the score of the home team that played at brunswick street oval with a crowd larger than 12,000?
CREATE TABLE "round_18" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "venue" text,
  "crowd" real,
  "date" text
);
SELECT "home_team_score" FROM "round_18" WHERE "crowd">'12,000' AND "venue"='brunswick street oval';