Beastly sort of business working in support of roadside assistance provider (7)
I believe the answer is:
raccoon
'roadside assistance provider' is the definition.
I can't tell whether this defines the answer.
'beastly sort of business working in support of' is the wordplay.
'beastly sort of' becomes 'rac' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'business' becomes 'co' (short for company).
'working' becomes 'on' (e.g. a machine is working or on).
'in support of' means one lot of letters go next to another (in a down clue, some letters hold up others).
'rac'+'co'+'on'='RACCOON'
Can you help me to learn more?
(Other definitions for raccoon that I've seen before include "North American mammal with fur used for hats" , "North American omnivore" , "Furry American mammal" , "Omnivorous nocturnal mammal native to N and C America" , "US ring-tailed mammal" .)