Row with denials embracing single sweetheart (5)
I believe the answer is:
noise
'row' is the definition.
(I've seen this before)
'denials embracing single sweetheart' is the wordplay.
'denials' becomes 'nos' (more than one 'no').
'embracing' is an insertion indicator.
'single' becomes 'I' (one).
'sweetheart' becomes 'e' (the heart/centre of 'sweet').
'nos' enclosing 'i' is 'nois'.
'nois'+'e'='NOISE'
'with' is the link.
(Other definitions for noise that I've seen before include "Unwanted sound" , "Din, cacophony" , "Loud or disturbing sound" , "Rumour" , "Row" .)