Madame features in film The Cornwall Tourist? (5)

I believe the answer is:

emmet

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

'cornwall tourist?' is the definition.
'emmet' can be an answer for 'tourist?' (I've seen this before). I'm not sure about the 'cornwall' bit.

'madame features in film' is the wordplay.
'madame' becomes 'mme' (abbreviation).
'features in' means one lot of letters goes inside another.
'film' becomes 'ET' (E.T. the Extra-Terrestrial).
'mme' inserted inside 'et' is 'EMMET'.

'the' is the link.

Can you help me to learn more?

(Other definitions for emmet that I've seen before include "Irish nationalist - archaic ant - Cornish holiday-maker" , "Robert, Irish patriot" , "Bookies' sign language" , "Dialect word for an ant" , "Insect" .)

I've seen this clue in The Times.

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