Greeting a female diver naked? (9)
I believe the answer is:
afternoon
'greeting' is the definition.
(afternoon is a kind of greeting)
'a female diver naked?' is the wordplay.
'female' becomes 'f' (abbreviation).
'diver' becomes 'tern' (type of diving bird).
'naked?' becomes 'O on' (resembles '0 on' ie 'nothing on').
'a'+'f'+'tern'+'oon'='AFTERNOON'
(Other definitions for afternoon that I've seen before include "Between noon and evening" , "Period between morning and evening" , "Midday to evening" , "Time of day" , "Then it's early in this!" .)