Girl briefly also called when touring state (6)
I believe the answer is:
alaska
'state' is the definition.
(Alaska is an example)
'girl briefly also called when touring' is the wordplay.
'girl' becomes 'lass' (lass can informally mean a girl).
'briefly' means to remove the last letter.
'also called' becomes 'aka' (also known as).
'when touring' means one lot of letters goes inside another.
'lass' with its last letter removed is 'las'.
'las' placed into 'aka' is 'ALASKA'.
(Other definitions for alaska that I've seen before include "Coldest US state" , "North-western US state" , "Anchorage location" , "Sarah Palin's home state" , "Forty-ninth US state" .)