Blue section of Alexandria Quarter (4)

I believe the answer is:

aqua

'blue' is the definition.
(aqua is a kind of blue)

'section of alexandria quarter' is the wordplay.
'section of' indicates the answer is hidden within the clue.
'AQUA' is hidden in the letters of 'alexandria quarter'.

(Other definitions for aqua that I've seen before include "shade" , "- Regia; - fortis" , "Tint of blue" , "Latin for water" , "Water; pale blue colour" .)

I've seen this clue in The Times.

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