Singer shows ardour but no composure (10)
I believe the answer is:
troubadour
'singer' is the definition.
(I know that troubadour is a type of singer)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for troubadour that I've seen before include "Poet-singer" , "composer of lyrics" , "love poet" , "Medieval lyric poet" , "Minstrel" .)