Foundation embraced by suburb as expected (4)
I believe the answer is:
base
'foundation' is the definition.
('base' can be a synonym of 'foundation')
'embraced by suburb as expected' is the wordplay.
'embraced' indicates a hidden word.
'BASE' is hidden in the letters of 'by suburb as expected'.
(Other definitions for base that I've seen before include "Pedestal" , "centre from which soldiers operate" , "standard" , "Mean - military installation" , "Foot; ignoble" .)