What silly butchers do at their conference? (4,5)

I believe the answer is:

talk tripe

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'what silly butchers do' is the definition.
I know nothing about this answer so I can't tell whether this works.

'at their conference?' is the wordplay.
'at' says to put letters next to each other.
'their' becomes 'tripe' (I can't justify this - if you can you should believe this answer much more).
'conference?' becomes 'talk' (I've seen this in another clue).
'tripe' put after 'talk' is 'TALK TRIPE'.

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I've seen this clue in the Evening Standard.

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