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 ill' is the subsidiary indication.
'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 "Passage between shelves in supermarket", "Passage between blocks of chairs", "Passage down the side of a church nave", "Passage between seats", "Corridor", "Passage between pews", "Walkway between seats", "Gangway", "Part of a church" and "Path between seats in church".)