Big dipper (6,7)

I think it could be either:

Which length description are you looking for?:

6,7

roller coaster

'big dipper' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for roller coaster that I've seen before include "Fairground ride" , "Series of emotional swings" , "scenic railway" , "Big dipper" , "entertainment at fair" .)

I've seen this clue in The Independent and The Guardian.

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