Crossword Genius

Officer alternatively taking prisoners (6)

Ross

I believe the answer is:

captor

I'm a little stuck... Click here to teach me more about this clue!

'officer alternatively taking prisoners' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'officer alternatively' is the wordplay.
'officer' becomes 'capt' ().
'alternatively' becomes 'or'.
'capt'+'or'='CAPTOR'

Can you help me to learn more?

(Other definitions for captor that I've seen before include "Holder of a prisoner" , "To carp (anag)" , "Person who has taken another prisoner" , "kidnapper, perhaps" , "One who takes a prisoner" .)

I've seen this clue in the Evening Standard.
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