Husband leaves Gulf State, securing good deal (7)
I believe the answer is:
bargain
'deal' is the definition.
('bargain' can be a synonym of 'deal')
'husband leaves gulf state securing good' is the wordplay.
'husband' becomes 'h'.
'leaves' is a deletion indicator.
'gulf state' becomes 'bahrain' (I've seen this before).
'securing' is an insertion indicator.
'good' becomes 'g' (abbreviation).
'bahrain' with 'h' taken out is 'barain'.
'barain' placed around 'g' is 'BARGAIN'.
(Other definitions for bargain that I've seen before include "Deal; cheap buy" , "Count on" , "Agreement; cheap item" , "Agreement, snip" , "Great deal!" .)