Sports event's reportedly why MK Dons land in Africa (8)
I believe the answer is:
gymkhana
'sports event's' is the definition.
(type of equestrian event)
'why mk dons land in africa' is the wordplay.
'why' becomes 'y'.
'dons' means one lot of letters goes inside another (don means to wear or put on).
'land in africa' becomes 'ghana'.
'y'+'mk'='ymk'
'ymk' going inside 'ghana' is 'GYMKHANA'.
'reportedly' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
(Other definitions for gymkhana that I've seen before include "Equestrian sports event" , "At which horses display a range of skills" , "Meet at which riders and horses display skills" , "sports competition" , "A horsey 28" .)