I will be heard in the passage (5)
I believe the answer is:
aisle
'the passage' is the definition.
(aisle can mean a path or passageway)
'i will be heard' is the wordplay.
'i will' becomes 'ill' (I've seen this before).
'be heard' shows a homophone (sound like).
'ill' is a homophone of 'AISLE'.
'in' is the link.
(Other definitions for aisle that I've seen before include "Passageway between blocks of seats" , "Way between seating areas" , "Part of supermarket" , "A key" , "Passage between shelves in supermarket" .)