Fearful of law case over crossing moor illegally (8)
I believe the answer is:
timorous
'fearful' is the definition.
('timorous' can be a synonym of 'fearful')
'case over crossing moor illegally' is the wordplay.
'case' becomes 'suit' ('suit' can be a synonym of 'case').
'over' shows that the letters should be reversed in order.
'crossing' indicates putting letters inside.
'moor illegally' becomes 'moro' (I can't explain this - if you can you should give a lot more credence to this answer).
'suit' in reverse letter order is 'tius'.
'tius' going around 'moro' is 'TIMOROUS'.
'of law' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for timorous that I've seen before include "Shy, nervous" , "Shrinking by nature" , "Not bold, nervously hesitant" , "Shy, mouselike" , "showing fear" .)