Roman square in Mediterranean complex (5)

I believe the answer is:

mixed

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'complex' is the definition.
(thesaurus)

'roman square in mediterranean' is the wordplay.
'roman square' becomes 'ix' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'mediterranean' becomes 'med' (I've seen this in other clues).
'ix' placed inside 'med' is 'MIXED'.

Can you help me to learn more?

(Other definitions for mixed that I've seen before include "Blended" , "For both sexes" , "Varied" , "Mingled" , "Assorted" .)

I've seen this clue in The Independent.

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