A particular military unit (6)

I believe the answer is:

detail

I believe this clue is a double definition.

'a particular' is the first definition.
('detail' can be a synonym of 'particular')

'military unit' is the second definition.
(detail is a kind of military unit)

(Other definitions for detail that I've seen before include "Particular - military detachment" , "party" , "Tailed into minutiae" , "Small group of troops given special duty" , "Troop detachment; small feature" .)

I've seen this clue in The Telegraph.

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