By the sound of it, I’ll row (5)
I believe the answer is:
Here is my best explanation:
'row' is the definition.
'by the sound of it i'll' is the wordplay.
'by the sound of it' shows a homophone (sound like).
'ill' is a homophone of 'AISLE'.
(Other definitions for aisle that I've seen before include "Path between seats in church", "Passageway between blocks of seats", "Side passage", "Passage between rows of seats", "Church passage", "Supermarket section", "Way between seats", "Extension of the nave in a church", "Passageway between pews" and "Church walkway".)