Prosaic fellow interrupting criminal in court (10)
I believe the answer is:
unromantic
'prosaic' is the definition.
(thesaurus)
'fellow interrupting criminal in court' is the wordplay.
I cannot really understand how this works, but
'fellow' could be 'man' (fellow can mean a man) and 'man' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for unromantic that I've seen before include "displaying no outward affection" , "As classical music may be narrowly called" , "Not loving or amorous" , "Hard-headed" , "without affection?" .)