Fine person with wicked urge (4,3)
I believe the answer is:
good egg
'fine person' is the definition.
(I've seen this before)
'wicked urge' is the wordplay.
'wicked' becomes 'good' (I can't justify this - if you can you should believe this answer much more).
'urge' becomes 'egg' (as in egging someone on).
'good'+'egg'='GOOD EGG'
'with' is the link.
Can you help me to learn more?
(Other definitions for good egg that I've seen before include "Stout fellow (not the curate's?)" , "Words of approval" , "Trustworthy person?" , "Sound fellow (unlike the curate's?)" , "Lowest point of ship" .)