CREATE TABLE table_52556 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What was the away team's score at the game played at Lake Oval that had a crowd of over 15,000?
SELECT "Away team score" FROM table_52556 WHERE "Crowd" > '15,000' AND "Venue" = 'lake oval'
SELECT "Away team score" FROM "table_52556" WHERE "Crowd" > '15,000' AND "Venue" = 'lake oval'