Ignore amorous advance with vocal farewell (4,2)
I believe the answer is:
pass by
'ignore' is the definition.
(I've seen this in another clue)
'amorous advance with vocal farewell' is the wordplay.
'amorous advance' becomes 'pass' (I've seen this before).
'with' says to put letters next to each other.
'vocal' shows a homophone (sound like).
'farewell' becomes 'bye' (bye is a kind of farewell).
'bye' is a homophone of 'by'.
'pass'+'by'='PASS BY'
(Other definitions for pass by that I've seen before include "neglect" , "Go on and leave alone" , "Overlook; go beyond" , "Move along in the vicinity" , "Go past - disregard" .)