Daydream, perhaps, as France is divided (14)

I believe the answer is:

departmentally

'as france is divided' is the definition.
(France is divided into departments)

I don't understand the rest of the clue.

(Other definitions for departmentally that I've seen before include "how a big firm should be organised?" , "In small groups" .)

I've seen this clue in The Times.

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