Pipeline Filter - When text field is Not empty/Null

Hi team, 
I am trying to run a pipeline when user updates Field 10, 

1. Field 10 is updated
2. Create an entry 
3. Clear Field 10 with {{CLEAR}} -> to blank it 

When I run pipeline with above logic , pipeline runs twice , it counts {{CLEAR}} as an update on field field . I tried below logics

1. Field 10 is updated with filter {'10'.XEX.''} but pipeline runs twice
2. Field 10 is updated with filter {'10'.WC.'*'}, but pipeline runs twice
3. Field 10 is updated with filter {'10'.WC.'?'}, pipeline runs once but {{CLEAR}} no longer works

Any ideas