Lacking a Proper Arch for Support

This page is the CodyCross answer for the clue below from Small World, Group 689, Puzzle 3 (Photo Booth Pictures).

Question is: Lacking a Proper Arch for Support

and the answer is: FLATFOOT

Word Meaning:

FLATFOOT — (medicine, chiefly in the plural) A condition in which the arch of the foot makes contact with the ground.

Definitions from Wiktionary.