Shelter from unsuitable exposure (3)
I believe the answer is:
lee
'shelter' is the definition.
(I've seen this before)
'from unsuitable exposure' is the wordplay.
'from' indicates a hidden word.
'LEE' can be found hidden inside 'unsuitable exposure'.
(Other definitions for lee that I've seen before include "Confederate general" , "Protection" , "The sheltered side of something" , "Shelter" , "Commander of the Confederate States Army in the American Civil War" .)