Some fear a chest infection? (7)
I believe the answer is:
earache
'infection' is the definition.
(type of infection)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for earache that I've seen before include "complaint to The Listener" , "a problem for some listeners" , "Incessant complaining" , "Form of torture" , "Pain in aural organ" .)