This person talks a long time: flipping endlessly (6)

I believe the answer is:

gasbag

'this person' is the definition.
(gasbag is a kind of person)

I cannot understand how the rest of the clue works.

(Other definitions for gasbag that I've seen before include "One who natters a lot" , "This can be elevating" , "He likes to talk" , "Prattler" , "Person who talks too much - or a balloon" .)

I've seen this clue in The Times.

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