What is the average round number with wide receiver as position and Clark University as the college and the pick number is bigger than 166?
CREATE TABLE "nfl_draft" (
  "round_num" real,
  "pick_num" real,
  "player" text,
  "position" text,
  "college" text
);
SELECT AVG("round_num") FROM "nfl_draft" WHERE "position"='wide receiver' AND "college"='clark university' AND "pick_num">166;