Chest: one heard having trouble with it? (6)
I believe the answer is:
coffer
'chest' is the definition.
(I know that coffer is a type of chest)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for coffer that I've seen before include "safe" , "A large strong box for valuables" , "Strongbox" , "Small chest for keeping valuables" , "Money chest sounds like one with lung trouble" .)