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One doggedly capable of a terrific start? (5)

Ross

I believe the answer is:

trier

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

This clue could be a double definition.

'one doggedly capable of' is the first definition.
The definition suggests a singular noun which matches the answer.

'a terrific start?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

Can you help me to learn more?

(Other definitions for trier that I've seen before include "One who makes an effort" , "Determined person" , "One always ready to have a go" , "One who doesn't give up - judge?" , "Test" .)

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