Awkward part of puzzle cut, oddly messy (6)
I believe the answer is:
clumsy
'awkward' is the definition.
(I know that awkward can be written as clumsy)
'part of puzzle cut oddly messy' is the wordplay.
'part of puzzle cut' becomes 'clu' (I can't explain this - if you can you should give a lot more credence to this answer).
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternating letters of 'messy' are 'msy'.
'clu'+'msy'='CLUMSY'
Can you help me to learn more?
(Other definitions for clumsy that I've seen before include "Not dextrous" , "Cack-handed" , "Awkward in movement" , "Awkward and unskilful" , "Lacking grace in movement" .)