Eliminate whole ages with one note (5)
I believe the answer is:
erase
'eliminate whole' is the definition.
'erase' can be an answer for 'eliminate' (I've seen this in another clue). I am not sure about the 'whole' bit.
'ages with one note' is the wordplay.
'ages' becomes 'eras' (I've seen this before).
'with' says to put letters next to each other.
'one note' becomes 'e' (musical note).
'eras'+'e'='ERASE'
Can you help me to learn more?
(Other definitions for erase that I've seen before include "Rub out, expunge" , "Obliterate" , "Blank out" , "Blot out" , "Remove permanently" .)