Leaves are lumbered with the dynamite (6)
I believe the answer is:
sticks
'leaves are lumbered' is the definition.
I can't judge whether this definition defines the answer.
'with the dynamite' is the wordplay.
'with' means one lot of letters goes inside another.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'dynamite' becomes 'sicks' (I am not sure about this - if you are sure you should believe this answer much more).
't' inserted into 'sicks' is 'STICKS'.
Can you help me to learn more?
(Other definitions for sticks that I've seen before include "basic furniture" , "''... and stones may break my bones but names will never hurt me''" , "Old fogeys" , "Stands" , "potentially breaking our bones?" .)