Crossword Genius

Her majesty's personal units? (4)

Ross

I believe the answer is:

ones

'units?' is the definition.
('one' can be a synonym of 'unit')

I can't explain the remainder of the clue.

(Other definitions for ones that I've seen before include "Units" , "Aces" , "1 & 1 & 1" , "(Of ship) returning to port of origin" , "Singles" .)

I've seen this clue in The Times.
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