Given all the facts and acted as locum for (6,2)

I believe the answer is:

filled in

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'given' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for filled in that I've seen before include "well-informed" , "Acted as substitute" , "informed?" .)

I've seen this clue in the Evening Standard.

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