Make an acknowledgement, as doormen may well do (5)

I believe the answer is:

admit

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'do' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their base form.
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 admit that I've seen before include "Confess; allow in" , "Confess and permit entrance" , "Allow access" , "Confess - acknowledge" , "Recognise" .)

I've seen this clue in The Irish Independent.

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