Shaver cut chin, left mark (5)
I believe the answer is:
child
'shaver' is the definition.
(I know that shaver can be written as child)
'cut chin left mark' is the wordplay.
'cut' means to remove the last letter.
'left mark' becomes 'ld' (I am not sure about this - if you are sure you should believe this answer much more).
'chin' with its last letter taken off is 'chi'.
'chi'+'ld'='CHILD'
Can you help me to learn more?
(Other definitions for child that I've seen before include "Juvenile" , "Offspring" , "Baby" , "Young person" , "Youngster" .)