Woman undressed in garden the previous day (3)
I believe the answer is:
eve
This clue is a double definition.
'woman undressed in garden' is the first definition.
(in the Garden of Eden)
'the previous day' is the second definition.
(I've seen this before)
(Other definitions for eve that I've seen before include "Threshold" , "Day before; girl's name" , "comes before Jan. 1st" , "Day before; first woman" , "Day before a festival" .)