Support rent about everybody rejected (6)
I believe the answer is:
pillar
'support' is the definition.
(pillar is a kind of support)
'rent about everybody rejected' is the wordplay.
'rent' becomes 'rip' (synonyms).
'about' indicates putting letters inside.
'everybody' becomes 'all' (I've seen this before).
'rejected' says the letters should be written in reverse.
'rip' enclosing 'all' is 'rallip'.
'rallip' in reverse letter order is 'PILLAR'.
(Other definitions for pillar that I've seen before include "Supporting column" , "Stylite would live on it" , "Column; admired member (of community)" , "monument?" , "person providing reliable support" .)