Cover a lot of jealousy and run off with loved one (8)
I believe the answer is:
envelope
'cover' is the definition.
(I know that envelope is a type of cover)
'run off with loved one' is the wordplay.
'run off' becomes 'elope' (synonyms).
'with' is a charade indicator (letters next to each other).
'loved one' becomes 'env' (I can't justify this - if you can you should give a lot more credence to this answer).
'elope' after 'env' is 'ENVELOPE'.
'a lot of jealousy and' acts as a 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 envelope that I've seen before include "Green fruit" , "Rectangular paper container" , "jacket" , "Sheath, wrapping" , "Container for pager" .)