First track setters, after tense outburst from one of them? (3,2,2)

'first track' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'setters after tense outburst from one of them?' is the wordplay.
I cannot really understand how this works, but
'setters' could be 'us' and 'us' is found in the answer.
'tense' could be 't' (abbreviation used in many dictionaries) and 't' is present in the answer.
'from' could be 'of' (I've seen this in other clues) and 'of' is present in the answer.
'of' could be 'o' and 'o' is found within the answer.
A single letter 'w' remains which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?