Backs up about doggerel (8)
I believe the answer is:
reverses
'backs' is the definition.
(I've seen this before)
'up about doggerel' is the wordplay.
'up' becomes 'res' (I am not sure about this - if you are sure you should believe this answer much more).
'about' indicates putting letters inside.
'doggerel' becomes 'verse' (I've seen this in another clue).
'res' enclosing 'verse' is 'REVERSES'.
Can you help me to learn more?
(Other definitions for reverses that I've seen before include "Setbacks" , "Goes backwards" , "Defeats" , "Moves backwards" , "Backs up" .)