Found it!
https://archiveofourown.org/works/1373596
I may be describing two different fics with the following descriptions/scenes or it might be one fic.
1. Clint is de aged and being kept at SHIELD because they don’t know if he’s a security threat. He makes a lube slip and slide in the hallways to mess with people. Jasper Sitwell slides across without problems but some of the agents get angry with Clint and try to attack him. Tony (?) sees this and tells SHIELD that they are taking Clint home/out of SHIELD.
2. Tony says that de-aged Clint is his favorite because “he’s a little shit”.
https://archiveofourown.org/works/1373596
I may be describing two different fics with the following descriptions/scenes or it might be one fic.
1. Clint is de aged and being kept at SHIELD because they don’t know if he’s a security threat. He makes a lube slip and slide in the hallways to mess with people. Jasper Sitwell slides across without problems but some of the agents get angry with Clint and try to attack him. Tony (?) sees this and tells SHIELD that they are taking Clint home/out of SHIELD.
2. Tony says that de-aged Clint is his favorite because “he’s a little shit”.