Zurich gnome, less big, makes food served on board?

'on board?' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'zurich gnome less big makes food' is the wordplay.
I cannot quite understand how this works, but
'food' could be 'cheese' (cheese is a kind of food) and 'cheese' is found within the answer.
The remaining letters 'swiss' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'served' acts as a link.

Can you help me to learn more?