Cater badly for boxing (5)
I believe the answer is:
crate
'boxing' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'cater badly' is the wordplay.
'badly' is an anagram indicator.
'cater' with letters rearranged gives 'CRATE'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for crate that I've seen before include "Jalopy" , "Wooden box" , "Old car" , "old banger" , "Box for shipping" .)