What created substantial issue in small period of prosperity? (4,4)
I believe the answer is:
baby boom
'what created substantial issue' is the definition.
I can't judge whether this definition defines the answer.
'small period of prosperity?' is the wordplay.
'small' becomes 'baby'.
'period of prosperity?' becomes 'boom' (I've seen this before).
'baby'+'boom'='BABY BOOM'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for baby boom that I've seen before include "Period of increased birth rate" , "Comparatively small report" , "Sudden sharp increase in the birth rate" , "Period of high birthrate" , "Explosive increase in birth rate?" .)