Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_87 (round INTEGER, school_club_team VARCHAR, overall VARCHAR, position VARCHAR)

### Question ###
What is the average round for Wisconsin when the overall is larger than 238 and there is a defensive end?

### Accurate SQL ###

SELECT AVG(round) FROM table_name_87 WHERE overall > 238 AND position = "defensive end" AND school_club_team = "wisconsin"