Local snack for Old Bob Arnold (6)

I believe the answer is:

sarnie

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

'local snack' is the definition.
'sarnie' can be an answer for 'snack' (informal term for a sandwich). I am not certain of the 'local' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sarnie that I've seen before include "Popular bread-based snack (colloq)" , "no classy fare" , "Sandwich (informal)" , "Bread and filling snack (informal)" , "Familiar form of snack" .)

I've seen this clue in the Irish Times.

Want a hint initially instead of a full solution? Install my app