Crossword Genius

If you start this event, you will never reach the end (5,4)

Ross

I believe the answer is:

relay race

I'm a little stuck... Click here to teach me more about this clue!

'if you start this event you will never reach the end' is the definition.
'relay race' can be an answer for 'event' (relay race is a kind of event). I am not sure about the rest of the definition.

'if you start this event' is the wordplay.
I cannot really see how this works, but
'event' could be 'relay' (I've seen this before) and 'relay' is located in the answer.
The remaining letters 'race' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for relay race that I've seen before include "Foot speed contest passing batons" , "having started, one couldn't finish it" , "Speed contest with teams of four runners" , "Team contest" , "Event in which a baton is passed" .)

I've seen this clue in The Guardian.
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