Open a French type of sandwich (6)

I believe the answer is:

unwrap

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'open' is the definition.
(I've seen this before)

'a french type of sandwich' is the wordplay.
'a french' becomes 'un' ('a' in French).
'type of sandwich' becomes 'wrap' (I can't justify this - if you can you should believe this answer much more).
'un'+'wrap'='UNWRAP'

Can you help me to learn more?

(Other definitions for unwrap that I've seen before include "peel" , "Remove the outer cover" , "Reveal" , "Open (a present)" , "Remove packaging from" .)

I've seen this clue in The Telegraph.

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