Man the worm doesn't like to see approaching it! (4)
I believe the answer is:
bill
'man' is the definition.
(short for William)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for bill that I've seen before include "Narrow promontory" , "parliamentary proposal" , "Note - police - invoice - list" , "American banknote; man's name" , "amount owed" .)