Fool removes pressure for pal (4)
I believe the answer is:
chum
'for pal' is the definition.
(both can mean a friend)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for chum that I've seen before include "Close friend (colloq.)" , "Salmon" , "Pal, buddy" , "Good friend" , "Informally, a close friend" .)