City quartermaster and brigadier initially infiltrating battery (5)

I believe the answer is:

aqaba

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'city' is the definition.
(I know that Aqaba is a city)

'quartermaster and brigadier initially infiltrating battery' is the wordplay.
'initially' indicates taking the first letters.
'infiltrating' indicates putting letters inside.
'battery' becomes 'aa' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The first letters of 'quartermaster and brigadier' is 'qab'.
'qab' inserted within 'aa' is 'AQABA'.

Can you help me to learn more?

(Other definitions for aqaba that I've seen before include "Jordan's port" , "Part of Jordan" , "Gulf in Red Sea" , "Jordanian port" , "Asian port" .)

I've seen this clue in The Times.

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