Speaks out about this being smoked as they dine (5,2)

I believe the answer is:

pipes up

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'speaks' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?

'about this being smoked as they dine' is the wordplay.
I cannot really understand how this works, but
'being' could be 'pi' (PI is an example) and 'pi' is present in the answer.
'dine' could be 'sup' (synonyms) and 'sup' is found within the answer.
This explanation may well be incorrect...

'out' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Times.

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