Ape goes round a new shelter (6)
I believe the answer is:
canopy
'shelter' is the definition.
(I know that canopy is a type of shelter)
'ape goes round a new' is the wordplay.
'ape' becomes 'copy' (synonyms).
'goes round' means one lot of letters goes inside another.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'a'+'n'='an'
'copy' placed around 'an' is 'CANOPY'.
(Other definitions for canopy that I've seen before include "Hangong cover as over a bed" , "Roof-like awning" , "Cockpit cover" , "tester" , "in the topmost branches" .)