The Collaborative International Dictionary of English v.0.48:

Clinker-built \Clink"er-built\, a. (Naut.)
   Having the side planks (af a boat) so arranged that the lower
   edge of each overlaps the upper edge of the plank next below
   it like clapboards on a house. See Lapstreak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

clinker-built
    adj 1: having overlapping hull planks [syn: clinker-built,
           clincher-built, lap-strake, lap-straked, lap-
           streak, lap-streaked] [ant: carvel-built]