Watch one's opponent in this event? (4,5)

I believe the answer is:

time trial

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'watch one's opponent' is the definition.
The definition suggests a singular noun which matches the answer.

'in this event?' is the wordplay.
'in this' becomes 'time' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'event?' becomes 'trial' (trial is a kind of event).
'time'+'trial'='TIME TRIAL'

Can you help me to learn more?

(Other definitions for time trial that I've seen before include "Race against the clock" , "test" , "Cycling event" .)

I've seen this clue in The Telegraph.

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