Is this town a military one? (5)

I believe the answer is:

milan

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'is this town' is the definition.
'milan' can be an answer for 'town' (I've seen this before). I'm not sure about the remainder of the definition.

'a military one?' is the wordplay.
'a military' becomes 'mil' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'one?' becomes 'an' (an apple is one apple).
'mil'+'an'='MILAN'

Can you help me to learn more?

(Other definitions for milan that I've seen before include "Italian city with La Scala opera house" , "N. Italian city" , "Northern Italian city" , "City of northern Italy" , "province" .)

I've seen this clue in the Evening Standard.

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