Flooded, get wife into a tree (5)
I believe the answer is:
awash
'flooded' is the definition.
('awash' can be a synonym of 'flooded')
'wife into a tree' is the wordplay.
'wife' becomes 'w'.
'into' indicates putting letters inside.
'tree' becomes 'ash' (ash is a kind of tree).
'a'+'ash'='aash'
'w' placed within 'aash' is 'AWASH'.
'get' is the link.
(Other definitions for awash that I've seen before include "Letting in the sea" , "Partly under water" , "Flooded with water" , "Doused in water" , "not quite under" .)