Soldiers from Tunis (5)

I believe the answer is:

units

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'soldiers' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'from tunis' is the wordplay.
'from' indicates anagramming the letters (from the letters).
'tunis' is an anagram of 'UNITS'.

Can you help me to learn more?

(Other definitions for units that I've seen before include "Measures of alcohol" , "Single undivided wholes" , "Single things" , "military teams" , "Individual things, like pieces of furniture" .)

I've seen this clue in The Globe and Mail.

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