Bringing up central part of clause more formal (5)

I believe the answer is:

drier

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'more formal' is the definition.

I cannot understand how the rest of the clue works.

(Other definitions for drier that I've seen before include "You'll find this machine" , "Machine giving spin" , "More dull" , "Laundry machine" , "See 1" .)

I've seen this clue in The Telegraph.

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