Shelter from sun then is unusual (6,3)
I believe the answer is:
nissen hut
'shelter' is the definition.
(Nissen hut is an example)
'sun then is unusual' is the wordplay.
'unusual' indicates anagramming the letters.
'sun'+'then'+'is'='sunthenis'
'sunthenis' is an anagram of 'NISSEN HUT'.
'from' is the link.
(Other definitions for nissen hut that I've seen before include "Prefabricated corrugated iron dwelling" , "Prefab" , "Simple building" , "metal shelter" , "Corrugated iron construction" .)