One covers sporting legend broken up (7)
I believe the answer is:
trainer
'one covers sporting legend broken up' is the definition.
I can't judge whether this defines the answer.
'one covers sporting legend broken' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
'broken' could be 'ran' (running is a kind of breaking) and 'ran' is located in the leftover letters.
The remaining letters 'ter' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
(Other definitions for trainer that I've seen before include "He assists athlete to become fit" , "Machine that simulates the conditions of flying a plane" , "The odd thing an athlete may leave behind" , "Coach; shoe" , "Sports instructor" .)