Crossword Genius

Philosopher not working in unit of US soldiers (5)

Ross

I believe the answer is:

plato

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

This clue might be a double definition.

'philosopher' is the first definition.
(Plato is an example)

'working in unit of us soldiers' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'not' acts as a link.

Can you help me to learn more?

(Other definitions for plato that I've seen before include "Teacher of Aristotle, pupil of Socrates" , "Greek philosopher (The Republic)" , "A plot (anag) (known to Aristotle?)" , "Ancient Greek philosopher" , "To pal up with Greek philosopher" .)

I've seen this clue in The Times.
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