Condition of Ringing Ears
Puzzle 19 of At the Ballet Hard Pack
Question is: Condition of Ringing Ears
and the answer is: TINNITUS
Word Meaning:
TINNITUS — (otolaryngology, pathology) The experience of auditory sensations, such as a ringing or pulsating sound, occurring in the absence of any external stimulus.
Definitions from Wiktionary.