Crossword Genius

Be dressed in bin liner for online discussion (7)

Ross

I believe the answer is:

webinar

I'm a little stuck... Click here to teach me more about this clue!

'online discussion' is the definition.
(I've seen this before)

'be dressed in bin liner' is the wordplay.
I cannot quite understand how this works, but
'in' is within the answer.
This explanation may well be incorrect...

'for' is the link.

Can you help me to learn more?

(Other definitions for webinar that I've seen before include "Internet seminar" , "online discussion" .)

I've seen this clue in the Sydney Morning Herald.
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