The German roar going around pub is a sign food's ready (6,4)

'sign food's ready' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'the german roar going around pub' is the wordplay.
'the german' becomes 'der' ('the' in German).
'roar going' becomes 'bell' (I can't justify this - if you can you should believe this answer much more).
'around' indicates putting letters inside.
'pub' becomes 'inn' (an inn is a type of pub).
'der'+'bell'='derbell'
'derbell' placed around 'inn' is 'DINNER BELL'.

'is a' is the link.

Can you help me to learn more?