It informs you how much of a rise you got (8)
I believe the answer is:
altitude
'it informs you how much of a rise you got' is the definition.
The definition suggests a singular noun which matches the answer.
'it informs you how much of a' is the wordplay.
I cannot quite see how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is found within the answer.
'you' could be 'u' (I've seen this in other clues) and 'u' is located in the answer.
'a' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for altitude that I've seen before include "Height (above ground)" , "Lofty position" , "Elevation above sea level" , "Height above the earth's surface" , "Angular distance above the horizon" .)