Odd quote about a bishop keeling over (7)
I believe the answer is:
erratic
'odd' is the definition.
(thesaurus)
'quote about a bishop keeling over' is the wordplay.
'quote' becomes 'cite' ('cite' can be a synonym of 'quote'**).
'about' means one lot of letters goes inside another.
'bishop' becomes 'rr' (abbreviation for Right Reverend).
'keeling over' says the letters should be written backwards.
'a'+'rr'='arr'
'cite' going around 'arr' is 'citarre'.
'citarre' in reverse letter order is 'ERRATIC'.
(Other definitions for erratic that I've seen before include "Cartier (anag.)" , "Fickle" , "on irregular path" , "Eccentric, aberrant" , "Not regular in pattern" .)