Crossword Genius

Transaction securing flat, disposing of article in sections (12)

Ross

I believe the answer is:

departmental

I'm a little stuck... Click here to teach me more about this clue!

'transaction securing flat disposing' is the definition.
I can't judge whether this defines the answer.

'article in sections' is the wordplay.
I cannot really understand how this works, but
'article' could be 'art' (abbreviation for article) and 'art' is found within the answer.
This explanation may well be incorrect...

'of' is the link.

Can you help me to learn more?

(Other definitions for departmental that I've seen before include "Sort of store" , "Of an office" , "Relating to a division of a large organisation" , "section of business" , "Organised in units" .)

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