Auto business backing for example a charity event (6)
I believe the answer is:
garage
'auto business' is the definition.
(automobile business)
'backing for example a charity event' is the wordplay.
'backing' says the letters should be written in reverse.
'for example' becomes 'eg' ('e.g.' can be a synonym of 'for example').
'charity event' becomes 'rag' (rag is a term for a charitable student society).
'eg'+'a'+'rag'='egarag'
'egarag' in reverse letter order is 'GARAGE'.
(Other definitions for garage that I've seen before include "Attachment to the house" , "Housing for car(s)" , "Building for a car, or for its maintenance" , "Motor sales and service here" , "Observation" .)