Power department (6)

I believe the answer is:

agency

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This might be a double definition.

'power' is the first definition.
(thesaurus)

'department' is the second definition.
The definition and answer can be both groups as well as being singular nouns.
I also know that 'department' relates to this answer.

Can you help me to learn more?

(Other definitions for agency that I've seen before include "Business that acts for actors" , "Travel --; dating --" , "See 24 Across" , "The A in CIA" , "Business serving other businesses" .)

I've seen this clue in The Hindu.

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