Does such a man have taste in advertising? (8)

I believe the answer is:
sandwich
'taste in advertising?' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's a link between them I don't understand?
'does such a man' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'have' is the link.
Can you help me to learn more?
(Other definitions for sandwich that I've seen before include "Quick snack" , "Two slices of bread with filling" , "seaside town" , "Snack with bread" , "Common food item" .)
