Hide in shower (4)
I believe the answer is:
pelt
I believe this is a double definition.
'hide' is the first definition.
(I know that hide can be written as pelt)
'shower' is the second definition.
(showers of rain may be said to pelt)
'in' acts as a link.
(Other definitions for pelt that I've seen before include "Pour; hide" , "Shower with missiles - hide" , "Animal hide" , "Rain cats and dogs" , "Skin; run fast" .)