Shelter made from loose stones found on bottom of tarn (6)
I believe the answer is:
screen
'shelter' is the definition.
(thesaurus)
'loose stones found on bottom of tarn' is the wordplay.
'loose stones' becomes 'scree'.
'found on' is a charade indicator (letters next to each other).
'bottom of' suggests the final letters.
The final letter of 'tarn' is 'n'.
'scree'+'n'='SCREEN'
'made from' acts as a link.
(Other definitions for screen that I've seen before include "Room partition; vet" , "Room divider" , "Shield - broadcast" , "Sort out" , "Conceal; test" .)