Attack in Tulsa dispersed by retired South American (7)
I believe the answer is:
assault
'attack' is the definition.
(I know that attack can be written as assault)
'tulsa dispersed by retired south american' is the wordplay.
'dispersed' is an anagram indicator.
'by' is a charade indicator (letters next to each other).
'retired' is a reversal indicator.
'south american' becomes 'SA'.
'sa' reversed gives 'as'.
'tulsa' is an anagram of 'sault'.
'sault' put after 'as' is 'ASSAULT'.
'in' is the link.
(Other definitions for assault that I've seen before include "Storm" , "Strike" , "Physical attack" , "Onslaught" , "Sort of course" .)