what's the district with result being re-elected and candidates being clarence f. lea (d) unopposed
CREATE TABLE "table1_1342233_6" (
  "district" text,
  "incumbent" text,
  "party" text,
  "first_elected" real,
  "result" text,
  "candidates" text
);
SELECT "district" FROM "table1_1342233_6" WHERE "result"='Re-elected' AND "candidates"='Clarence F. Lea (D) Unopposed';