I agree with cutting trees (4)
I believe the answer is:
yews
'trees' is the definition.
(yew is a kind of tree)
'i agree with cutting' is the wordplay.
'i agree' becomes 'yes' (both are affirmative answers).
'with' becomes 'w' (abbreviation).
'cutting' means one lot of letters goes inside another (some letters cut their way into a word).
'yes' enclosing 'w' is 'YEWS'.
(Other definitions for yews that I've seen before include "woods" , "Evergreen trees" , "traditional churchyard residents" .)