Printing unit, sound and arousing jealousy (8)
I believe the answer is:
'jealousy' is the definition.
(I have seen 'Exciting jealousy' mean 'enviable' so perhaps 'jealousy' could also mean 'enviable')
'printing unit sound' is the wordplay.
'printing unit' becomes 'en' (I can't explain this - if you can you should give a lot more credence to this answer).
'sound' becomes 'viable' (I've seen this before).
'and arousing' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for enviable that I've seen before include "Be venial - it makes others jealous" , "Much to be desired" , "Causing a desire to have what another has" , "Likely to cause jealousy" , "Privileged - to be desired" .)