Either locked up or executed (9)

I believe the answer is:

committed

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'executed' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Maybe they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for committed that I've seen before include "Performed an act" , "Carried out" , "Dedicated" , "Bound or obligated" , "put away" .)

I've seen this clue in the Evening Standard.

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