The Collaborative International Dictionary of English v.0.48:

Clerkly \Clerk"ly\, a.
   Of or pertaining to a clerk. --Cranmer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Clerkly \Clerk"ly\, adv.
   In a scholarly manner. [Obs.] --Shak.
   [1913 Webster]