Crossword Genius

Nelson on track to lose Trafalgar, initially upset (5)

Ross

I believe the answer is:

pique

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'nelson on track' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pique that I've seen before include "nark" , "Animosity" , "Show of annoyance" , "Wound (pride); resentment" , "Nettle" .)

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