Expeditions in which are official inquiries? (6)

I believe the answer is:

quests

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'inquiries?' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for quests that I've seen before include "Long or arduous searches for something" , "Pilgrimages or searches" , "Searches and odysseys" , "Chivalric searches" , "Knightly searches" .)

I've seen this clue in the Evening Standard.

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