Rugger to be important? (6)
I believe the answer is:
matter
'rugger' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for matter that I've seen before include "Substance as opposed to spirit" , "Stuff - be of importance" , "Substance; topic" , "From which all physical things are made" , "Subject; be important" .)