Books about sport going over circuit (4)
I believe the answer is:
tour
'circuit' is the definition.
(synonyms)
'books about sport going over' is the wordplay.
'books' becomes 'OT' (abbreviation for Old Testament).
'about' is a reversal indicator.
'sport' becomes 'ru' (rugby union).
'going over' says the letters should be written in reverse.
'ot' in reverse letter order is 'to'.
'ru' in reverse letter order is 'ur'.
'to'+'ur'='TOUR'
(Other definitions for tour that I've seen before include "Go on holiday or inspection journey" , "Trip visiting several places" , "Journey round" , "... de France is a multi-stage cycle race" , "'Pleasure journey, visiting various places (4)'" .)