Fleece some of the characters caught up in Umbria homicide (6)
I believe the answer is:
mohair
'fleece' is the definition.
(I've seen this before)
'up in umbria homicide' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'in' indicates the answer is hidden within the clue.
'riahom' can be found hidden inside 'umbria homicide'.
'riahom' reversed gives 'MOHAIR'.
'some of the characters caught' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for mohair that I've seen before include "Fine goat's cloth" , "Fine silky wool of the angora goat" , "Fabric made from silky hair of angora goat" , "Fabric made from Angora goat wool" , "Fabric made from the coat of an Angora goat" .)