Confused fans weakening - it's very hard to read (9,4)

I believe the answer is:

finnegans wake

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'very hard to read' is the definition.
I can't tell whether this definition defines the answer.

'confused fans weakening' is the wordplay.
'confused' is an anagram indicator.
'fans'+'weakening'='fansweakening'
'fansweakening' is an anagram of 'FINNEGANS WAKE'.

'it's' is the link.

Can you help me to learn more?

(Other definitions for finnegans wake that I've seen before include "Book by James Joyce" , "James Joyce novel" , "book title" , "Irish achievement" , "Knew insane fag (anag) -- novel by 5" .)

I've seen this clue in The Irish Times.

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