Ineffective person, lacking force or power (6)

I believe the answer is:

eunuch

(Other definitions for eunuch that I've seen before include "Typical harem guard" , "Harem guard specially cut out for the job" , "Eg, harem guard" , "Castrated person" , "Castrated male, often guard in harem" .)

I've seen this clue in The Guardian.

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