An Anatomical Part That's Not So Amusing If Hit

This page is the CodyCross answer for the clue below from Airport, Group 454, Puzzle 1 (Runway Lighting).

Question is: An Anatomical Part That's Not So Amusing If Hit

and the answer is: FUNNYBONE

Word Meaning:

FUNNY BONE — (idiomatic) The ulnar nerve in the elbow, which, when hit, causes a tingling sensation.

Definitions from Wiktionary.