..... Leonardo urged with some passion (6)
I believe the answer is:
ardour
'passion' is the definition.
(ardour is a kind of passion)
'leonardo urged with some' is the wordplay.
'some' indicates the answer is hidden within the clue.
'ARDOUR' is hidden in the letters of 'leonardo urged with'.
(Other definitions for ardour that I've seen before include "Great enthusiasm or passion" , "Love, passion" , "Passion, rapture" , "Enthusiasm or warmth of passion" , "Great fire" .)