Sphere in a Pointing Device That Acts as a Cursor
This page is the CodyCross answer for the clue below from Train Travel, Group 706, Puzzle 5 (Falling Asleep).
Question is: Sphere in a Pointing Device That Acts as a Cursor
and the answer is: TRACKBALL
Word Meaning:
TRACKBALL — (computing) A pointing device consisting of a ball housed in a socket
Definitions from Wiktionary.