Anger one lot of soldiers

I believe the answer is:

ire

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'anger' is the definition.
(ire is intense rage)

'one lot of soldiers' is the wordplay.
'one' becomes 'i' (Roman numeral).
'lot of soldiers' becomes 're' (I can't explain this - if you can you should give a lot more credence to this answer).
'i'+'re'='IRE'

Can you help me to learn more?

(Other definitions for ire that I've seen before include "'Anger, wrath (3)'" , "Hot temper" , "resentment" , "exasperation" , "Strong feeling" .)

I've seen this clue in The Daily Mail.

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