Info attendant turned up about helping divisive issue (10,3)
I believe the answer is:
generation gap
'divisive issue' is the definition.
The definition suggests a singular noun which matches the answer.
'info attendant turned up about helping' is the wordplay.
'info' becomes 'gen' (informal term for information).
'attendant' becomes 'page' (page is a kind of attendant).
'turned up' is a reversal indicator.
'about' indicates putting letters inside.
'helping' becomes 'ration' (a ration is a serving or helping).
'page' in reverse letter order is 'egap'.
'egap' enclosing 'ration' is 'erationgap'.
'gen'+'erationgap'='GENERATION GAP'
Can you help me to learn more?
(Other definitions for generation gap that I've seen before include "Difference between parents and offspring" , "leading to power outage?" , "Difference in attitudes between the young and old" , "Page One rating (anag) - about 35 years!" , "cause of misunderstanding" .)