Units from zone seven (4)

I believe the answer is:

ones

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

'from zone seven' is the wordplay.
'from' indicates the answer is hidden within the clue.
'ONES' is hidden in the letters of 'zone seven'.

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

I've seen this clue in The Mirror.

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