Heard character having row (5)
I believe the answer is:
queue
'row' is the definition.
(I've seen this before)
'heard character' is the wordplay.
'heard' indicates a 'sounds like' (homophone) clue.
'character' becomes 'q'.
'q' is a homophone of 'QUEUE'.
'having' is the link.
(Other definitions for queue that I've seen before include "Pigtail; column" , "Line of people waiting (beloved by the British)" , "Tailback" , "Wait in line" , "Waiting list" .)