In prosperity, could such a friend open a shop? (5)
I believe the answer is:
bosom
'a friend open a shop?' is the definition.
I can't judge whether this definition defines the answer.
'in prosperity could' is the wordplay.
'in' is an insertion indicator.
'prosperity' becomes 'boom' (boom is a kind of prosperity).
'could' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'boom' going around 's' is 'BOSOM'.
'such' is the link.
Can you help me to learn more?
(Other definitions for bosom that I've seen before include "A close affectionate and protective acceptance" , "(Female's) chest" , "Embrace" , "This friend is dear and close" , "Female breasts" .)