Narrative supporting different names, so perhaps elevated (2,7)
I believe the answer is:
on message
'narrative supporting' is the definition.
The definition suggests a singular noun which matches the answer.
'different names so perhaps elevated' is the wordplay.
'different' indicates anagramming the letters (letters placed in a different order).
'perhaps' becomes 'eg' (for example).
'elevated' is a reversal indicator (in a down clue, letters go up).
'eg' in reverse letter order is 'ge'.
'names'+'so'='namesso'
'namesso' is an anagram of 'onmessa'.
'onmessa'+'ge'='ON-MESSAGE'
Can you help me to learn more?
(Other definitions for on message that I've seen before include "Following official line" , "keeping to the script" , "Following party line" , "in accordance with policy" , "Reflecting the official line" .)