How to call TearDown script from test step ?

my test have to clear data before run TestSuite and when run this test suite finished I want to clear data again (same as before run )
Current I have my code in 2 time (in my first test case -> cleardata and in Teardown)
so,
I want to write only in Teardown script and my first test case -> cleardata can call TearDown script.

pls give me some code to call TearDown script form test step.


thanks you.