Military grouping (8)

I think it could be either:

Which length description are you looking for?:

division

'military grouping' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for division that I've seen before include "Section of organisation" , "Difference of opinion" , "Mathematical act for a body of troops." , "Formal vote in Parliament" , "Arithmetic operation" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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