This film went down in a big way (7)

I believe the answer is:

titanic

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

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

'went down in a big way' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for titanic that I've seen before include "Ill-fated liner" , "Colossal, liner" , "Twenty one [SHIP]" , "Famous doomed transatlantic liner" , "Nineteen twelve iceberg victim" .)

I've seen this clue in the Evening Standard.

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