Shelter in Seventh Avenue (5)
I believe the answer is:
haven
'shelter' is the definition.
(I know that haven is a type of shelter)
'in seventh avenue' is the wordplay.
'in' indicates a hidden word.
'HAVEN' is hidden in the letters of 'seventh avenue'.
(Other definitions for haven that I've seen before include "A peaceful refuge" , "Harbour - shelter" , "relaxing place" , "Refuge; harbour" , "Small port, refuge" .)