One who cruises in a hat (6)

I believe the answer is:

boater

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'a hat' is the definition.
(I know that boater is a type of Hat)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for boater that I've seen before include "Flat-topped straw hat" , "one going in the junk?" , "Sailor's straw hat" , "sailor, perhaps" , "Hat; eg, rower" .)

I've seen this clue in the Sydney Morning Herald.

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