First person heard tune, but had trouble seeing (9)
I believe the answer is:
eyestrain
'trouble seeing' is the definition.
The answer and definition can be both states of affairs as well as being singular nouns.
Maybe there's a link between them I don't understand?
'first person heard tune but' is the wordplay.
'first person' becomes 'I' (first-person pronoun).
'heard' shows a homophone (sound like).
'tune but' becomes 'strain' (synonyms. I am not sure about the 'but' bit.).
'i' sounds like 'eye'.
'eye'+'strain'='EYESTRAIN'
'had' is the link.
Can you help me to learn more?
(Other definitions for eyestrain that I've seen before include "Vision tiredness" , "What may give blurred sight" , "Optic stress" , "A serenity leading to ocular stress" , "Optic fatigue" .)