Pale, slim naked lady having a day out (4)
I believe the answer is:
lily
This clue might be a double definition.
'pale slim naked lady' is the first definition.
'Lily' can be an answer for 'lady'. I'm not sure about the 'pale slim naked' bit.
'a day out' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'having' acts as a link.
Can you help me to learn more?
(Other definitions for lily that I've seen before include "- - Allen, singer" , "White" , "Flower, maybe of the valley" , "Eg, arum, calla" , "Fleur-de-lis" .)