Nelson on track to lose Trafalgar, initially upset (5)
I believe the answer is:
pique
'nelson on track' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
I don't understand the rest of the clue.
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" .)