Crossword Genius

Some security personnel use keys (4)

Ross

I believe the answer is:

type

'use keys' is the definition.
(type with a keyboard)

'some security personnel' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'TYPE' is hidden in the letters of 'security personnel'.

(Other definitions for type that I've seen before include "key" , "Mark" , "Sort; printed letters" , "Courier for example" , "Write letters" .)

I've seen this clue in The Independent.
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