One spot in front of the right kind of tree (4)
I believe the answer is:
acer
'tree' is the definition.
(I've seen this in other clues)
'one spot in front of the right kind' is the wordplay.
I cannot quite see how this works, but
'one' could be 'ace' (ace has a value of one in some card games) and 'ace' is located in the answer.
'right' could be 'r' (common abbreviation) and 'r' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for acer that I've seen before include "Type of maple" , "Tree with winged fruit" , "Care about the maple?" , "Care about this tree" , "Plant" .)