Chap, one chopping down tree (6)
I believe the answer is:
feller
'chap' is the definition.
(I know that chap can be written as feller)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for feller that I've seen before include "Chap informally" , "Bloke - lumberjack" , "employed in forestry" , "Man casually" , "the cause of planes crashing?" .)