The Collaborative International Dictionary
Clancular
Clancular \Clan"cu*lar\, a. [L. clancularius, from clanculum secretly, adv. dim. of clam secretly.] Conducted with secrecy; clandestine; concealed. [Obs.]
Not close and clancular, but frank and open.
--Barrow.
Wiktionary
clancular
a. (context obsolete English) Conducted with secrecy; clandestine; concealed.