Name a single state
I believe the answer is:
dubai
'state' is the definition.
(I've seen this before)
'name a single' is the wordplay.
'name' becomes 'dub' (as in dubbing someone with a particular name).
'single' becomes 'i' (one).
'dub'+'a'+'i'='DUBAI'
(Other definitions for dubai that I've seen before include "Port city of UAE" , "Arab city" , "Persian Gulf state" , "Country" , "Gulf sheikhdom" .)