Lubricate

4 clues
Oil
Slick
Make slippery
Squirt some WD-40 on
Similar answers:
Abdicate
Abdicated
Abdicates
Adjudicate
Adjudicates
Apricate
Auspicate
Authenticated
Birthcertificate
Certificate
Certificated
Certificatesofdeposit
Clubroom
Clubrooms
Communicate
Complicate
Contraindicated
Dedicate
Dedicated
Dedicatee