Very attractive girl, on the quiet (4)
I believe the answer is:
dish
'very attractive' is the definition.
I can't tell whether this definition defines the answer.
'girl on the quiet' is the wordplay.
'girl' becomes 'di' (short for Diane or Diana).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'the quiet' becomes 'sh' ('sh' is used to tell someone to be quiet).
'di'+'sh'='DISH'
Can you help me to learn more?
(Other definitions for dish that I've seen before include "Ruin" , "Spoil" , "Scotch" , "something in the oven?" , "Directional antenna -- good-looking woman or man" .)