One ringing to hear a pretty girl? (4)
I believe the answer is:
bell
'one ringing' is the definition.
(bell ringing is a kind of ringing)
'hear a pretty girl?' is the wordplay.
'hear' shows a homophone (sound like).
'a pretty girl?' becomes 'belle' (I've seen this before).
'belle' is a homophone of 'BELL'.
'to' is the link.
(Other definitions for bell that I've seen before include "Inventor - clanger" , "Telephone call?" , "Chime" , "Wide end of a trumpet" , "Instrument making ringing sound" .)