Back in Normandy: a Hungarian composer (5)
I believe the answer is:
Here is my best explanation:
'composer' is the definition.
(Haydn is an example)
'back in normandy a hungarian' is the subsidiary indication.
'back' says the letters should be written in reverse.
'in' says the answer is hidden in the clue.
'ndyah' can be found hidden inside 'normandy a hungarian'.
'ndyah' backwards is 'haydn'.
(Other definitions for haydn that I've seen before include "Austrian symphonist, d. 1809", "Barman", "The Surprise symphony composer, d. 1809", "Composer of over 100 symphonies", "Joseph -, prolific eighteenth to nineteenth century Austrian composer", "Classical composer", "Creation composer", "COMPOSER", "Austrian musician" and "Austrian composer, d.1809".)