Strange accents on air in America? (12)
I believe the answer is:
transoceanic
'in america?' is the definition.
(America is across the ocean from the UK)
'strange accents on air' is the wordplay.
'strange' indicates an anagram.
'accents'+'on'+'air'='accentsonair'
'accentsonair' is an anagram of 'TRANSOCEANIC'.
(Other definitions for transoceanic that I've seen before include "across the Pacific, say?" , "across the water" , "Crossing, eg, the Atlantic" .)