Single, Double or King-Size Cover Over a Mattress

This page is the CodyCross answer for the clue below from Top Secret, Group 2100, Puzzle 4 (Asset Extraction).

Question is: Single, Double or King-Size Cover Over a Mattress

and the answer is: FLATSHEET

Word Meaning:

FLAT SHEET — A bedsheet that lies flat over the mattress, not elasticated like a fitted sheet.

Definitions from Wiktionary.