Best officer in uniform one with friend (8)

I believe the answer is:

ultimate

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'best' is the definition.
(I've seen this before)

'officer in uniform one with friend' is the wordplay.
'officer in uniform' becomes 'ult' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one' becomes 'I' (Roman numeral).
'with' is a charade indicator (letters next to each other).
'friend' becomes 'mate' (mate is a kind of friend).
'ult'+'i'+'mate'='ULTIMATE'

Can you help me to learn more?

(Other definitions for ultimate that I've seen before include "Mutilate in final way" , "Utmost; last" , "Eventual" , "Happening last" , "Last or final in a series or process" .)

I've seen this clue in The Sun.

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