Lad from Bangladesh confused affair (7)
I believe the answer is:
shebang
'affair' is the definition.
('shebang' can informally refer to a matter or situ)
'lad from bangladesh confused' is the wordplay.
'from' is a deletion indicator.
'confused' indicates an anagram.
'bangladesh' with 'lad' taken out is 'bangesh'.
'bangesh' with letters rearranged gives 'SHEBANG'.
(Other definitions for shebang that I've seen before include "The whole thing?" , "affair in America" , "Matter" , "business" , "Entire operation" .)