Climbs right before noon to get additional note (5)
I believe the answer is:
ramps
'climbs' is the definition.
(ramping is a kind of climbing)
'right before noon to get additional note' is the wordplay.
'right' becomes 'r' (abbreviation).
'before noon' becomes 'AM' (as in AM on a clock).
'to get' is a charade indicator (letters next to each other).
'additional note' becomes 'ps' (a PS or postscript in a letter. I am not sure about the 'additional' bit.).
'r'+'am'+'ps'='RAMPS'
Can you help me to learn more?
(Other definitions for ramps that I've seen before include "Small road ridges for prams" , "Slopes to calm traffic" , "Gradients" , "Sloping passages" , "Slopings passages" .)