Relaxes in overseas estate (5)
I believe the answer is:
eases
'relaxes' is the definition.
(ease can mean to relax or reduce)
'in overseas estate' is the wordplay.
'in' says the answer is hidden in the clue.
'EASES' is hidden within 'overseas estate'.
(Other definitions for eases that I've seen before include "Borders, margins" , "Makes more comfortable" , "Facilitates" , "Makes less severe" , "Alleviates, relieves" .)