Crossword Genius

Possibly long calculation for army unit (8)

Ross

I believe the answer is:

division

I believe this clue is a double definition.

'possibly long calculation' is the first definition.
(as in long division)

'army unit' is the second definition.
(division is a kind of army unit)

'for' acts as a link.

(Other definitions for division that I've seen before include "Part of a whole, a section" , "Large army unit" , "Discord, split" , "part of force" , "A number of teams grouped together in sport according to ability" .)

I've seen this clue in The Times.
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