Introduce American hero? (8)

I believe the answer is:

sandwich

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This might be a double definition.

'introduce american' is the first definition.
'sandwich' can be an answer for 'introduce' (sandwiching is a kind of introducing). I'm not certain of the 'american' bit.

'hero?' is the second definition.
(hero is a kind of sandwich)

Can you help me to learn more?

(Other definitions for sandwich that I've seen before include "Golf club" , "it's easy to scoff" , "The snack gives you bad chin wads" , "Snack-inventing earl" , "Make it with bread and a filling" .)

I've seen this clue in The Times.

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