Passage the author will read aloud (5)
I believe the answer is:
aisle
'passage' is the definition.
(aisle can mean a path or passageway)
'author will read aloud' is the wordplay.
'author' becomes 'ais' (I can't explain this - if you can you should believe this answer much more).
'will' becomes 'll' (contracted form, as in 'he'll' - 'he will').
'read aloud' shows a homophone (sound like).
'll' sounds like 'le'.
'ais'+'le'='AISLE'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for aisle that I've seen before include "Part of a church" , "Part of supermarket" , "Passageway between pews" , "Extension of the nave in a church" , "lateral strip" .)