I may include last cutting from hazel in planter (7)
I believe the answer is:
settler
'cutting from hazel in planter' is the definition.
'settler' can be an answer for 'planter' (thesaurus). I'm unsure of the 'cutting from hazel in' bit.
'i may include last' is the wordplay.
'i' becomes 'setter' (the person that set this crossword).
'may include' means one lot of letters goes inside another.
'last' becomes 'l' (this might be a standard abbreviation which I don't know about).
'setter' placed around 'l' is 'SETTLER'.
Can you help me to learn more?
(Other definitions for settler that I've seen before include "Early mover into an area" , "One colonising new area" , "new inhabitant" , "Coloniser - arbitrator" , "New colonist" .)