Hastily prepares note about something in the way (11)
I believe the answer is:
cobblestone
'something in the way' is the definition.
I can't tell whether this definition defines the answer.
'hastily prepares note about' is the wordplay.
'hastily' becomes 'cobbles' (I am not sure about this - if you are sure you should believe this answer much more).
'prepares' indicates anagramming the letters (I've seen 'prepare' mean this).
'about' is an insertion indicator.
'note' with letters rearranged gives 'tone'.
'cobbles' placed within 'tone' is 'COBBLESTONE'.
Can you help me to learn more?
(Other definitions for cobblestone that I've seen before include "Rounded irregular lump used in paving" , "Piece of road surfacing material" , "Traditional road surface block" , "small part of the way" , "Part of old road surface" .)