"first" Row in a Plane
This page is the CodyCross answer for the clue below from House of Horrors, Group 1105, Puzzle 3 (Grandfather Clock).
Question is: "first" Row in a Plane
and the answer is: BULKHEAD
Word Meaning:
BULKHEAD — (nautical) A vertical partition dividing the hull into separate compartments; often made watertight to prevent excessive flooding if the ship's hull is breached.
Definitions from Wiktionary.