Where naval battles were fought while a spy was out with a girl (6)
I believe the answer is:
narvik
'where naval battles were fought while a' is the definition.
The definition suggests a singular noun which matches the answer.
'spy was out with a girl' is the wordplay.
I cannot quite understand how this works, but
'girl' could be 'vi' (short for Violet) and 'vi' is present in the answer.
'spy' could be 'nark' (I've seen this before) and 'nark' is found within the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for narvik that I've seen is " Norwegian port".)