Uncomplaining, study portable shelter (7)
I believe the answer is:
content
'uncomplaining' is the definition.
(thesaurus)
'study portable shelter' is the wordplay.
'study' becomes 'con' (I've seen this before).
'portable shelter' becomes 'tent' (I've seen this before).
'con'+'tent'='CONTENT'
(Other definitions for content that I've seen before include "Quietly happy" , "state of peaceful happiness" , "Satisfied; volume" , "Elements" , "Gist" .)