Agree visuals should be jazzed up for old-fashioned food? (5,7)

I believe the answer is:

liver sausage

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'food?' is the definition.
(liver sausage is a kind of food)

'agree visuals should be jazzed up for old-fashioned' is the wordplay.
'agree visuals' anagrams to 'LIVER SAUSAGE'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for liver sausage that I've seen before include "savoury paste" , "deli purchase" , "savoury spread" , "Rolled meat paste" .)

I've seen this clue in The Telegraph.

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