Composer in European city missing northern Australia (7)
I believe the answer is:
berlioz
'composer' is the definition.
(I've seen this before)
'european city missing northern australia' is the wordplay.
I cannot quite see how this works, but
'european' could be 'e' (abbreviation e.g. EU) and 'e' is found within the answer.
'australia' could be 'oz' (informal name for Australia) and 'oz' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for berlioz that I've seen before include "French composer, d. 1869" , "French composer,1803-69" , "Symphonie fantastique composer, d. 1869" , "One composer" , "French composer, 1803-69" .)