Well-provided-for, having arms from the east (4)
I believe the answer is:
snug
'well-provided-for' is the definition.
(snug can mean well-provided-for or comfortable)
'arms from the east' is the wordplay.
'arms' becomes 'guns ' (gun is a kind of arm).
'from the east' says the letters should be written backwards (on a map from right to left).
'guns' in reverse letter order is 'SNUG'.
'having' is the link.
(Other definitions for snug that I've seen before include "Bar-parlour" , "Comfortabel with guns" , "Cosy retreat" , "Compact" , "joiner" .)