Said to be the first man to get a mother (4)
I believe the answer is:
adam
'said to be the first man' is the definition.
I know that 'first' relates to this answer.
'get a mother' is the wordplay.
'get' is a charade indicator (letters next to each other).
'mother' becomes 'dam' (female parent of an animal).
'a' next to 'dam' is 'ADAM'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for adam that I've seen before include "First guy" , "Robert ..., ... Clayton" , "Biblical first man" , "Father of Cain and Abel" , "who transformed the Palladian style?" .)