Patronised and irritable in South Atlantic? (9)
I believe the answer is:
sponsored
'patronised' is the definition.
('sponsor' can be a synonym of 'patronize')
'irritable in south atlantic?' is the wordplay.
'irritable' becomes 'sore' (sore can mean annoyed or irritated).
'in' indicates putting letters inside.
'south' becomes 's' (abbreviation).
'atlantic?' becomes 'pond' (as in 'across the pond').
's'+'pond'='spond'
'sore' placed inside 'spond' is 'SPONSORED'.
'and' is the link.
(Other definitions for sponsored that I've seen before include "(Of event) supported financially" , "With backing" .)