Potentially contains shelter (4)
I believe the answer is:
tent
'shelter' is the definition.
(tent is a kind of shelter)
'potentially contains' is the wordplay.
'contains' indicates the answer is hidden within the clue.
'TENT' is hidden in the letters of 'potentially'.
(Other definitions for tent that I've seen before include "Canvas shelter; wine" , "Cloth shelter" , "Portable shelter for camper" , "pavilon" , "Portable shelter - red wine" .)