Cold as ice, perhaps, around capital in Tashkent (6)
I believe the answer is:
stolid
'cold' is the definition.
'ice perhaps around capital in tashkent' is the wordplay.
'ice perhaps' becomes 'solid' (ice is a kind of solid).
'around' is an insertion indicator.
'capital in' indicates taking the first letters.
The initial letter of 'tashkent' is 't'.
'solid' placed around 't' is 'STOLID'.
'as' acts as a link.
(Other definitions for stolid that I've seen before include "Not easily aroused" , "Strongly built" , "Phlegmatic" , "Heavy" , "Emotionally insensitive" .)