Historic hothead at the United Nations? (3)

I believe the answer is:

hun

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'historic hothead at the united nations?' is the definition.
I can't judge whether this defines the answer.

'hothead at the united nations?' is the wordplay.
'hothead' becomes 'h' (head letter of 'hot').
'at' is a charade indicator (letters next to each other).
'the united nations?' becomes 'UN' (abbreviation).
'h'+'un'='HUN'

Can you help me to learn more?

(Other definitions for hun that I've seen before include "Asiatic invader" , "One led by Attila" , "Barbarian" , "Warlike nomad" , "old invader" .)

I've seen this clue in the Evening Standard.

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