Crossword Genius

Daydream in divisions? (14)

Ross

I believe the answer is:

departmentally

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'daydream in' is the definition.
The definition suggests an adverb which matches the answer.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

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

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