Wisdom of Turkish commander in southern metropolis (8)
I believe the answer is:
sagacity
'wisdom' is the definition.
(sagacity is a kind of wisdom)
'turkish commander in southern metropolis' is the wordplay.
'turkish commander' becomes 'aga' (I've seen this before).
'in' is an insertion indicator.
'southern' becomes 's' (abbreviation).
'metropolis' becomes 'city' ('city' can be a synonym of 'metropolis').
's'+'city'='scity'
'aga' put within 'scity' is 'SAGACITY'.
'of' acts as a link.
(Other definitions for sagacity that I've seen before include "It's a cagy kind of wisdom" , "Good judgement, wisdom or shrewdness" , "showing wisdom" , "of judgments" , "Astuteness" .)