Charming girl who comes out holding Mike? (8)
I believe the answer is:
debonair
'charming' is the definition.
(I've seen this before)
'girl who comes out holding mike?' is the wordplay.
'girl who comes out' becomes 'deb' (short for debutante, someone coming out to society).
'holding mike?' becomes 'onair' (holding a microphone).
'deb'+'onair'='DEBONAIR'
(Other definitions for debonair that I've seen before include "Elegant, sophisticated" , "Cheerful, charming and elegant" , "I broaden out, being self-confident and carefree" , "Of good appearance and manners" , "(Of man) stylish, charming" .)