Ring quick. It's a girl! (5)
I believe the answer is:
olive
'a girl' is the definition.
(girl's name)
'ring quick it's' is the wordplay.
'ring' becomes 'O' (O is the shape of a ring).
'quick' becomes 'liv' (I can't justify this - if you can you should believe this answer much more).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'o'+'liv'+'e'='OLIVE'
Can you help me to learn more?
(Other definitions for olive that I've seen before include "A Med. fruit" , "A Med. fruit-tree" , "One's stoned" , "Its branch is a peace emblem" , "girl" .)