Issuing an invitation and expecting an answer (6)

I believe the answer is:

asking

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'answer' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for asking that I've seen before include "Inquiring" , "Proposing" , "Presenting petition" , "Making enquiries" , "It demands explanation!" .)

I've seen this clue in the Evening Standard.

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