City rendered inert for military convenience (7)

I believe the answer is:

latrine

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'military convenience' is the definition.
'latrine' can be an answer for 'convenience' (latrine is a kind of convenience). I'm not certain of the 'military' bit.

'city rendered inert' is the wordplay.
'city' becomes 'la' (Los Angeles).
'rendered' indicates an anagram.
'inert' with letters rearranged gives 'trine'.
'la'+'trine'='LATRINE'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for latrine that I've seen before include "Lavatory (in barracks)" , "waste disposal unit" , "Military convenience - reliant (anag)" , "where to go in the army" , "Toilet in a military area" .)

I've seen this clue in The Daily Express.

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