Greeting husband, unwell (7)
I believe the answer is:
hailing
'greeting' is the definition.
(hailing is a kind of greeting)
'husband unwell' is the wordplay.
'husband' becomes 'h'.
'unwell' becomes 'ailing' ('ailing' can be a synonym of 'unwell').
'h'+'ailing'='HAILING'
(Other definitions for hailing that I've seen before include "Raining ice" , "Greeting" , "Waving to (a taxi)" .)