Dump man beginning to make a mark (6)
I believe the answer is:
stigma
'mark' is the definition.
(synonyms)
'dump man beginning to make a' is the wordplay.
'dump man' becomes 'stig' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'beginning to' suggests taking the first letters.
The first letter of 'make' is 'm'.
'stig'+'m'+'a'='STIGMA'
Can you help me to learn more?
(Other definitions for stigma that I've seen before include "Mark of shame, stain on reputation" , "Symbol of disgrace or infamy" , "Disgraceful sign" , "Mark of infamy or disgrace" , "Disgraceful mark" .)