Asian last character to remain in United Kingdom (5)
I believe the answer is:
uzbek
'asian' is the definition.
(I've seen this before)
'last character to remain in united kingdom' is the wordplay.
'last character' becomes 'Z'.
'to remain' becomes 'be' (eg be patient, remain patient).
'in' means one lot of letters goes inside another.
'united kingdom' becomes 'UK' (synonyms).
'z'+'be'='zbe'
'zbe' put inside 'uk' is 'UZBEK'.
(Other definitions for uzbek that I've seen before include "Coming from Tashkent" , "Native of Tashkent, perhaps" , "Language of Tashkent" , "Eg, native of Tashkent" , "Someone from Tashkent?" .)