Fixtures in north taken on by northbound Redgrave? (6)
I believe the answer is:
events
'fixtures' is the definition.
'north taken on by northbound redgrave?' is the wordplay.
'north' becomes 'N' (abbreviation).
'taken on by' is an insertion indicator (inserted letters get taken on or taken in).
'northbound' says the letters should be written in reverse.
'redgrave?' becomes 'Steve' (Steve Redgrave the British rower).
'steve' backwards is 'evets'.
'n' placed inside 'evets' is 'EVENTS'.
'in' acts as a link.
(Other definitions for events that I've seen before include "competition" , "contests" , "Horse-riding competitions" , "Significant incidents" , "Important or notable happenings" .)