Awkward part alongside Charlie Brown (10)
I believe the answer is:
cumbersome
'awkward' is the definition.
(I've seen this before)
'part alongside charlie brown' is the wordplay.
'part' becomes 'some' (I've seen this before).
'alongside' is a charade indicator (letters next to each other).
'charlie brown' becomes 'cumber' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'some' put after 'cumber' is 'CUMBERSOME'.
Can you help me to learn more?
(Other definitions for cumbersome that I've seen before include "Awkward" , "Unwieldy" .)