That lady gets together with a big noise for affair (7)
I believe the answer is:
shebang
'affair' is the definition.
('shebang' can informally refer to a matter or situ)
'that lady gets together with a big noise' is the wordplay.
'that lady' becomes 'she' ('she' refers to a woman).
'gets together with' is a charade indicator (letters next to each other).
'a big noise' becomes 'bang' (bang is a kind of noise. I am not sure about the 'big' bit.).
'she'+'bang'='SHEBANG'
'for' is the link.
Can you help me to learn more?
(Other definitions for shebang that I've seen before include "The whole ___ (entirely)" , "Matter" , "business" , "(Whole) kit and caboodle" , "Whole affair" .)